HX3.6 Installation Manual

>>HX3.6_Installationsanleitung (deutsch)

Version of August 28th 2024, as of firmware version 6.036 and up

HX3.6 single-board sound engine for connecting any keyboard, for installation into existing organs or MIDI control

HX3.6 board ready for installation

Preface

HX3.6 should be installed by a qualified technician only. You should be familiar with ribbon cable mounting, crimp contact installation and soldering of delicate parts. Important: Boards contains static sensitive components. Be sure to use anti-static tools and grounded soldering toolset. HX3.6 firmware versions are available for MIDI control as well as direct keyboard control by means of our FatarScan2, Scan61-Inline, Scan16-Strip and (obsolete) OrganScan61 boards. For upgrade from HX3.5 to HX3.6, also see the HX3.6 Migration Guide (english).

• HX3.6 mainboard is factory programmed as MIDI expander. It will work after power-up without any additional boards attached (i.e. open pin headers).

• For updates and HX3.6 Manager download, visit the HX3.6 Files Page for most recent and beta firmware, manuals, schematics and tools. Updates in ZIP file (named HX36_Update_6xxx.zip) contain HX3.6 Manager application as well as DSP firmware, sound bank(s), FPGA configuration images and scan drivers.

• A complete set of PDF schematics including peripherals is available for download on our Schematics Page and Drawings Page.

• See HX3.6 Mainboard User Manual, printable PDF file for usage instructions after installation.

• HX3.6 Editor (required for installation) now is part of the HX3.6 Manager package. A complete user manual is available as PDF for download on our Update Server.

Connectors and Jumpers

HX3.6 Components/Connector placement (also avalable as PDF, see on our Documentation and Update Server)

HX3.6 Mainboard connectors
PL1	HX3 Extension Board (optional)
PL2	6,3mm jack audio output right
PL3	Stereo audio output; mid = GND
PL4	Stereo audio mixer input; mid = GND
PL5	6,3mm jack audio output left
PL6	DSP Debug (do not use)
PL7	FPGA Debug (do not use)
PL8	Scan Board (FatarScan2)
PL9	DC input, 5V or 9..12V/500mA, Plus on center contact
PL10	DC input/ouput, 5V/500mA
PL11	DC input, 9..12V/500mA
PL12	Scan Board (Scan16-Strip, Scan61-Inline, OrganScan61 or Bass25)
PL13	MIDI IN1
PL14	MIDI IN1/IN2/OUT (if external jacks see schematics)
PL15	MIDI IN2/OUT (as configered by jumpers on PL20)
PL16	Aux digital I/O, for some scan drivers sustain and cancel inputs (active low)
PL17	ARM Cortex M3 Debug (do not use)
PL18	SD card adapter (or ISP AVR)
PL19	Connector for FT800 grafical display
PL20	MIDI IN/OUT configuration jumpers
PL21	MIDI control for MAG Vent, TTL level
PL22	Serial interface for FTDI cable
PL23	Bluetooth or WiFi module (BLE)
PL24	4-pin connector USB to HX3.5 Extension Board
PL25	USB jack (MIDI over USB, updates)
PL26	I2C bus (menu panel/preset boards)
PL27	MPX bus (DBX drawbar and PTX pot boards)
PL28	3-pin connector rotary control foot switch (note wrong label "SWELL" on older PCB!)
PL29	3-pin connector FC-7 compatible swell pedal (note wrong label "FOOTSW" on older PCB!)
PL30	6,3mm jack rotary control
PL31	Analog inputs 0 to 11 (default drawbars upper manual)
PL32	Analog inputs 12 to 23, (default drawbars lower manual)
PL33	Vibrato rotary switch (optional)
PL34	6,3mm jack swell pedal (FC-7 compatible)
PL35	Buttons/switches 0 to 7 (default percussion, vib on, rotary control)
PL36	Buttons/switches 8 to 15 (default presets or vibrato buttons, reverb, bypass, split

HX3.6 Mainboard Jumper
JP1	Analog Gnd (Probe Connection), both pins
JP2	5V DC input on PL10/PL12 (wall wart connector) if jumpered
JP3	Config Disable (do not use)
JP4	Power supply over USB (can cause noise)
JP5	Digital Gnd (Probe Connection), both pins
Default jumper setting: 2 jumpers on PL20 pin 2-3 and 5-6 (leftmost pin is 1) for second MIDI IN

HX3.6 board revision b2 has two additional jumpers to reverse tip/ring connection of swell pedal, located behind SWELL jack. Select the HAMD position if your swell pedal has a different pin assignment than the Yamaha FC7 (for FC7: Plug tip = reference voltage, potentiometer end position, plug ring = analog input, potentiometer wiper).

HX3.6b2 Jumper set for FC7: Tip = reference voltage, potentiometer end position, ring = potentiometer wiper

HX3.6b2 Jumper set for Hammond (also some others): Tip = analog input, potentiometer wiper, ring = reference voltage

HX3.6b2 Additional Jumpers
JP6, JP7	Select Hammond or Yamaha FC7 pinout of swell pedal jack
Default jumper setting: 2 jumpers in position FC7

Power Supply

The HX3.6 board may be powered either from coaxial DC input PL9 (5.5/2.1 mm plug, plus on center pin, DC 9V 500mA wall wart) or from green DC connectors PL11 (9 to 12V input) or PL10 (5V input; 5V output when 9 to 12V power provided to DC jack PL10 or PL9). Voltages exceeding 5.2V on PL10 will destroy the board!

If you have to use an external 5V DC supply on DC input PL10, insert JP2 (near DC jack). We do not recommend this configuration since inadvertently connecting a DC supply with more than 5V output will destroy the board!

After powering on, a red LED near PL17 will flicker briefly; it will also flicker when the HX3.6 controller is busy. When the RealOrgan Sound Engine is ready, a yellow LED will dim; it will "breathe" with rotary simulation speed. When the Effects/GM DSP is ready, a blue LED will flash every second. The blue LED will blink on/3x briefly off when the DSP is in Bootload mode, ready to accept a DFU firmware update by USB.

Preparing HX3.6 for first Use

From factory HX3.6 boards are programmed with MIDI Expander firmware (no analog inputs). It should deliver a basic organ sound on audio outputs with MIDI input even with no other peripherals connected. Basic functions are available if a MenuPanel is connected. You have to set at least some System Init parameters after installing a different firmware. See Installation by HX3.6 Manager section below.

MenuPanel

HX3 MenuPanel, fitted with optional LEDs

Our MenuPanel allows convenient adjustments of various HX3 parameters to tweak your setup. Two versions available, short one without indicator LEDs intended for organ installation.

Connect HX3 MenuPanel to PL26 PANEL using a 10-wire flat ribbon cable. If you use the HX3 MenuPanel in parallel/simultaneously with Preset12-2 and Preset16 boards, it should be the last module on the chain connected to PL26, since it has only one bus connector.

Newer long version menu panels have a separate connector for the 7 LEDs that goes to PL35 on the mainboard.

Serial USB cable

FTDI cable connected to HX3

For fast board configuration you may use a serial connection through FTDI USB adaptor cable or USB interface connected to PL22 (cable colors imprinted). Alternatively, you may use the USB port or even the MIDI IN/OUT jacks through a third-party USB to MIDI interface. See HX3 Manager User Manual, printable PDF file for details.

Configuration by SD Card

If an SD card adapter with an FAT 32 formatted SD card is detected, HX3.6 starts up in bootloader mode. To perform an update from the SD card press the menu panel encoder button. Only those parts are updated for which a corresponding file (.BIN, .DAT) is found on the card.

Alternatively to single files a single packed DFU file can be created with the HX3.6 Manager BootLoad and stored on the card. It is treated by HX3.6 exactly like a DFU update via USB cable. Updates are usually delivered by us as such a DFU file.

Please note: If new firmware has been installed, some System Inits settings are persistent and may need to be changed for your configuration to work.

Advanced users may create their own INI scripts containig all neccessary commands which do basically the same as HX3.6 Editor. See page HX3.6 SD Card Usage for details.

Configuration by HX3 Manager

Alternatively, connect HX3.6 to your PC via USB. Start HX3.6 Manager, connect to HX3.6 and open Updater window. Complete or partly updates may be triggered by menus. "Get Board Info" should show current configuration. See HX3 Manager User Manual, printable PDF file for details.

Checklist:

• Is MIDI IN working? Brand new boards should deliver a basic organ sound on audio outputs with MIDI input on MIDI channel 1. Right 5-pin DIN connector (seen from back) is always a MIDI IN.
• Is an appropiate Scan Driver installed? You may replace the Scan Driver by using the Updater in HX3.6 Manager. Use Update menu and select "Scan Driver file". HX3.6 Updater will prompt for a DAT file, open either scanmidi.dat, scansr61.dat, or scanfatr.dat, depending on your needs.
• Are HX3.6 System Inits correct? HX3.6 will not scan buttons or analog inputs if not set correctly. Use the Editor in HX3.6 Manager and click on pink System Inits button. Click Get Group in the Action menu to refresh table entries.
• Are analog drawbar inputs working? With all analog inputs enabled (parameter 1503>1), check if changes on drawbars are to be seen on Upper DB rsp. all other analog input groups when clicking Get Group button.
• Are analog volume inputs working? Non-working analog inputs may have been remapped to "not assigned". See Analog Remap group.

Updates

See page HX3 Manager User Manual, printable PDF file or page HX3.6 SD Card Usage for details.

Updating DSP Soundbanks

See page HX3 Manager User Manual, printable PDF file for details.

Parameter Tweaking

Adding hardware to your HX3.6 board may require some parameter tweaking to get it running. By factory, HX3.6 is configured as a MIDI expander; it will not poll or drive any peripherals attached except the MenuPanel. For example, if you attach the FatarScan2 board, you need to update the scan driver as well. If you attach drawbars, buttons or switches, you need to enable these.

As of today, tweaking parameters that are not present in the menu system is only possible by HX3.6 Editor.

MIDI Configuration

The HX3.6 board is configured by factory as MIDI Expander with two MIDI inputs. Left MIDI DIN connector (seen from back) is MIDI IN2 by default. It may be configured as MIDI OUT by changing jumper setting on pin header PL18 according to following table (pin 1 is near USB connector, pin 10 is near DIN socket). For +5V phantom supply on MIDI IN set jumpers on pins 7-8 and 9-10. When phantom supply jumpers are installed, DIN jack carries ground on middle pin 2 and +5V on two otherwise unused outer pins 1 and 3. Phantom supply may be used to power BASS25 MIDI scan board connected to left DIN socket.

PL20 - function of left MIDI jack
Funktion	JP on pin	JP on pin	Gnd (blue) JP on pin	Vcc (red) JP on pin
MIDI OUT	1-2	4-5	7-8	open
MIDI IN	2-3	5-6	open	open
MIDI IN w/ phantom +5V	2-3	5-6	7-8	9-10
Pin 1 is left, seen from back

MIDI over USB is available if USB socket PL25 is installed, Mini USB socket adaptor (optional) or HX3 Extension Board is connected by cable to PL32. Please note: Due to hardware restrictions, MIDI IN2 and USB MIDI IN must not be used simultaneously. Transmission errors will occur!

USB Port

An USB type B connector may be soldered to position PL25 if needed. It is not populated by factory to ensure mechanical compatibility with existing rear panels. In addition, the USB signal is available on header PL24 (near USB jack) to route USB to our HX3.5 extension board. The USB port is configured as a "MIDI over USB" device by default. In DFU update mode it becomes the port for the HX3.6 DSP update application.

Important: When using a "MIDI over USB" connection (as the HX3 Manager does), disconnect any MIDI device from secondary (left) MIDI input DIN jack as they share the same MIDI input line.

USB port is also used for DSP firmware or soundbank updates.

Mini USB Adaptor installation

For use with the HX3.4 back panel with mini-USB cutout, connect the mini-USB adapter as follows:

HX3.6 PL24	USB adapter	USB cable color
G	GND	black
D +	D +	green
D -	D -	white
V +	VCC	red

Audio Outputs

In addition to left/right 1/4" audio jacks, the stereo audio signal is present on PL3 (center = analog ground).

Connecting Analog Inputs

HX3.6 provides 24 internal analog inputs, all located on pin headers PL31 and PL32, as well as up to 64 external analog inputs via DBX6, DBX9, DBX12 drawbars and PTX4-25/35 potentiometer assemblies connected to PL27 MPX bus input. All analog inputs are DC controlled. Input voltage range is from 0V (off or minimal volume) to +3.3V (max. volume). With factory configuration all analog inputs are disabled, so that HX3.6 may be used without any switches/drawbars/pots connected. You may leave internal connectors PL31 and PL32 open if you plan to control by MIDI only.

Assigning Analog Inputs

To enable analog control inputs, use the HX3.6 Editor application to set parameter #1503 to value 2 (when old DB9-MPX drawbars are to be used on PL31/PL32) or 3 (otherwise). Individual analog inputs may be disabled or re-routed in the HX3.6 Editor's Analog Remap section, parameters #5000 to #5023 (for internal inputs PL22/PL23) and #5024 to #5088 (external inputs on PL20). See section HX3.6_Installation_Manual#Mixing_DB9.2FDB12_and_DBX_Drawbar_Sets for details.

When individual internal input pins on PL31/PL32 are not used (i.e. remain open, no drawbar or pot installed), set corresponding parameter #5000..#5023 to "254 - Not assigned". To disable all internal inputs on PL31/PL32, set parameter #5000 to "255 - End of table". Same applies to PL27 MPX bus inputs: If no additional DBX or PTX boards are connected, set parameter #5024 to "255 - End of table".

Note: Do not assign an organ function to more than one analog input.

Input Check & Monitoring

All assigned inputs should be connected to a physical control. Otherwise, inputs will "float" and HX3.6 will send random MIDI control values at a high rate; this can make an update impossible.

HX3.6 Editor provides a monitoring function to check physical button states and raw analog input voltages. Click "Input Monitor" button and tick checkboxes of input types you want to monitor. Input voltage changes should appear immediately in the table(s). When you click on a table entry, the main table jumps to the associated assignment group.

Internal Analog Inputs

To use internal analog inputs on PL31 and PL32, set System Inits parameter #1503 to 2 or 3. Set Analog Remap parameters #5000 to #5023 according to your pin assignment. By default, pin assignment is set to HX3.4 DB9/DB12 compatibility.

Connecting Drawbar Boards DB9/DB11/DB12

Drawbar and pot connection to PL22 and PL23 (click picture to enlarge)

Lower manual configuration with Drawbar12 (A# preset key, left) and Drawbar9-MPX (B preset key, right). Connects to HX3 via long flat ribbon cable (right). Upper manual configuration is similar, but uses Drawbar9 or Drawbar11 instead of Drawbar12.

Classic drawbar sets DB9/DB11/DB12 may be used for single drawbar set configurations. Connection to our old drawbar boards DB9 and DB12 is simple: DB9 (upper) connects to PL31 ANLG UPR, DB12 (lower) connects to PL32 ANLG LWR via 16-wire flat ribbon cable (length up to 1m, plugs wired 1:1). DB9 provides 3-pin headers for connection of Tone and Amp122 Volume pots.

Additional DB9-MPX boards (obsolete - use DBX drawbar modules instead) may be inserted for configurations with dual drawbar sets per manual. Secondary DB9-MPX drawbar sets should be located right to corresponding primary DB9 or DB12 drawbars as on Hammond Consoles. A short flat ribbon cable connects both (see picture).

DB9 and DB11/12 are compatible and interchangeable, despite additional drawbars for bass pedals resp. tone/amp volume.

Connecting other Drawbar Pots

You may also use your own or existing drawbars as follows: At least connect 9 drawbars or slider pots and Leslie volume control pot to PL31 ANLG UPR. R value should be in the 10 kOhm to 47 kOhm range, linear taper (for example type B10K). Note that using audio taper (log.) drawbar pots as found in various older LSI and transistor organs will not yield correct loudness and drawbar position on MenuPanel display.

Any analog input may be "soft wired" to any analog function with HX3.6 Editor's Analog Remap section. By default, analog functions are mapped to keep HX3.4 compatibility as shown below.

PL31 ANLG UPR - Control Voltages Upper Manual
Pin 1	Drawbar 16
Pin 2	Drawbar 5 1/3
Pin 3	Drawbar 8
Pin 4	Drawbar 4
Pin 5	Drawbar 2 2/3
Pin 6	Drawbar 2
Pin 7	Drawbar 1 5/9
Pin 8	Drawbar 1 1/3
Pin 9	Drawbar 1
Pin 10	Master Volume Pot
Pin 11	Amp Pot, simulated tube amp volume
Pin 12	Assigned pot (assignable with HX3.6 Editor)
Pin 13, 14	Drawbar/Pot common ground GND
Pin 15	Drawbar set A/B switching signal (may be tied to pin 16)
Pin 16	Drawbar/Pot end 3.3V+ (reference)

PL32 ANLG LWR - Control Voltages Lower Manual
Pin 1	Drawbar 16
Pin 2	Drawbar 5 1/3
Pin 3	Drawbar 8
Pin 4	Drawbar 4
Pin 5	Drawbar 2 2/3
Pin 6	Drawbar 2
Pin 7	Drawbar 1 5/9
Pin 8	Drawbar 1 1/3
Pin 9	Drawbar 1
Pin 10	Drawbar Bass 16
Pin 11	Drawbar Bass 8
Pin 12	Drawbar/Pot Pedal Sustain
Pin 13, 14	Drawbar/Pot common ground GND
Pin 15	Drawbar set A/B switching signal (may be tied to pin 16)
Pin 16	Drawbar/Pot end 3.3V+ (reference)

Even with MIDI control, a swell pedal should be connected to SWELL jack for faster response. This overrides MIDI volume control. You may connect a swell pedal like Yamaha FC-7 or a simple volume pot to the SWELL jack.

HX3 mainboard is set to tone/treble and amp volume control inputs active by factory (may be altered also with HX3.6 Editor). Tone pot center is connected to pin 10 of PL31. Pin 11 becomes the Leslie amp volume/drive control (mandatory). Amp volume pot center is connected to pin 11 of PL31. Both pots begin with GND and end with Ref 3.3V+.

Please note: Open analog inputs (unconnected) will "float" and change randomly, even with presets active. Disable unused inputs with HX3.6 Editor's Analog Remap section (set to "254 - Not assigned").

External Analog Inputs (PL27 MPX bus)

DBX9 drawbar set for connection to PL20 MPX bus input, shortened on right side to fit into organ (click picture to enlarge)

DBX12 drawbar set in 9+3 configuration for B3-like installations. Note that right connector PL4 (bottom mount) cannot be used as space is occupied by drawbar potentiometer. Use top connector PL8 or right solder pads to chain drawbar sets. (click picture to enlarge)

Chained DBX6 drawbar set and PTX4-35 potentiometer assembly, suited for ADRS, volume or equalizer control (click picture to enlarge)

DBX12 and DBX9 drawbar sets chained with top connectors. Alternatively solder pads on left and right side can be used. (click picture to enlarge)

Does not apply to current version: Due to a design quirk on DBX12 v4 and DBX9 v4 drawbar sets, a wire must be soldered to PL8 pin 2 and pin 5 as shown when top connectors are used. (click picture to enlarge)

Please note: Boards in version 3.6b require a small attenuation adapter between PL27 and the first DBX, ANX or PTX board, otherwise there will be interference in the analog scanning with certain cable lengths. The adapter is connected to PL27 with the “HX3” side, the DBX output then leads on to the analog controllers. This adapter was included with the HX3 mainboards. If you are converting an HX3 MIDI expander, for example, you can request the adapter free of charge. It is not required for boards with the revision number HX3.6b2.

We recommend DBX6/DBX9/DBX12 (6, 9 or 12 DrawBars multipleXed), ANX8 (8 ANalog multipleXed inputs) and PTX4-25 or PTX4-35 (4 PoTentiometers multipleXed) assemblies for new organ designs as they greatly simplify the installation. These boards carry their own multiplexers/shift register ICs, so they can be daisy-chained via the MPX bus system, a 10-wire flat ribbon cable connected to PL27 MPX on HX3.6 mainboard. Any number of DBX6, DBX9, DBX12, ANX8 and PTX4 modules may be be strung together in any order until the maximum capacity of 64 analog controls is reached. The 24 internal inputs on PL31/PL32 can be used independently, so this adds up to a total of 88 analog inputs.

DBX Connector Installation

DBX boards are provided with two angled 10-pin headers. All DBX drawbar boards are available without drawbar potentiometers installed. Please order drawbar potentiometers and knobs separeately. Insert drawbars into solder pads from bottom of PCB (no silk screen lettering) on desired positions, turn over and place on an even surface before soldering to maintain even spacing.

To be used in tight installations, all DBX boards may be cut along white lines on board without affecting function, using a fine toothed saw blade. This must be done before mounting of drawbar potentiometers.

DBX6 Drawbar Module

DBX6 boards are suitable for ADSR, equalizer or volume control with 4 to 6 drawbars. With 6 drawbars mounted, right bottom chain header position is occupied by last drawbar. In this case, use solder pad wire connections or top mounted headers for chaining boards.

DX6 input assignment (6 versatile drawbars)
DBX6 Drawbar	R1	R2	R5	R6	R7	R8		Next Board
Input #	+0	+1	+2	+3	+4	+5		+6...

DBX9 Drawbar Module

DBX9 boards are suitable for classic 9 harmonic drawbar installations on B3- or M100-like organ consoles. They offer additional 3 analog inputs (if needed) for connection of own potentiometers (10k to 47k types suitable). To use these, set "solder blob" jumper JP1 open and JP2 closed (12 analog inputs mode). Potentiometer inputs are available on 6-pin connectors PL2 (not mounted; all 6-pin connectors are wired in parallel, same pinout). The inputs are also available on 5 solder pads marked AIN +9 to AIN +11, as well as GND and VREF (common to all pots).

Jumper settings via removing or adding solder blobs:

Jumper settings DBX9
Konfiguration	JP1	JP2
9 Drawbars on DBX9	open	closed
9 Drawbars and 1 to 3 Pots on DBX9	closed	open

Input assignment DBX9
DBX9 Drawbar	R1	R2	R4	R5	R6	R7	R9	R11	R12		Next Board
Input #	+0	+1	+2	+3	+4	+5	+6	+7	+8		+9...
Input assignment for B3-like installation (9 drawbars, JP2 closed)

Input assignement DBX9 + 3 analog inputs
DBX9 Drawbar	R1	R2	R4	R5	R6	R7	R9	R11	R12	AIN+9	AIN+10	AIN+11		Next Board
Input #	+0	+1	+2	+3	+4	+5	+6	+7	+8	+9	+10	+11		+12...
Input assignment for B3-like installation (9 drawbars) plus 3 additional pot inputs (JP1 closed)

Note: Next Board is assignment of first control of next module in chain (on right side of this module).

The assignment of the 6-pin header for the connection of further potentiometers is as follows:

Pinout of 6-pin header PL2
Pin	Function
1	Input AIN+9
2	Input AIN+10
3	Input AIN+11
4	(not connected)
5	VREF (common pot end)
6	GND (common pot ground)

DBX12 Drawbar Module

DBX12 boards are suitable for 12 harmonic drawbar installations on H100-, Böhm- or Wersi-like organ consoles. Drawbar positions DB+0 to DB+11 are populated, rightmost position R16 remains empty.

However, it is possible to use DBX12 boards in a B3-like 9+3 drawbar configuration (i.e. 9 upper or lower on left side, one space and 3 pedal drawbars on right side). In this case, do not populate R13 (space), use positiion R16 (rightmost) instead. Note that position R16 (pedal sustain) is handled as input #9 (R13), not #12. In either case, DBX12 only has 12 inputs, not 13. It is not possible to populate DBX12 as 3+9 drawbars (pedal drawbars on left side), as position R13 and R16 share the same analog input! See section HX3.6_Installation_Manual#Typical_Applications for details.

Jumper settings via removing or adding solder blobs. Note: Next Board is assignment of first control of next module in chain (on right side of this module).

Jumper setting DBX12
Configuration	JP1	JP2
12 Drawbars on DBX12	closed	open
9+3 Drawbars on DBX12	closed	open

Input assignment DBX12 in H100 configuration
DBX12 Drawbar	R1	R2	R4	R5	R6	R7	R9	R11	R12	R13	R14	R15	no R16		Next Board
Input #	+0	+1	+2	+3	+4	+5	+6	+7	+8	+9	+10	+11	none		+12...
Input assignment for H100 like installation (12 drawbars) with R13 installed, no R16

Input assignment DBX12 in B3 like configuration
DBX12 Drawbar	R1	R2	R4	R5	R6	R7	R9	R11	R12	no R13	R14	R15	R16		Next Board
Input #	+0	+1	+2	+3	+4	+5	+6	+7	+8	none	+10	+11	+9		+12...
Input assigment for B3 like installation (9 harmonic drawbars plus 3 pedal drawbars) with R16 installed, no R13

PTX4 Potentiometer Module

PTX4-25 and PTX4-35 boards feature 4 high quality potentiometers, available with or without middle detent. The only difference is the distance from one pot to next (25mm on PTX4-25, 35mm on PTX4-35). Any number of PTX4 boards may be inserted anywhere in the MPX bus chain. A single PTX4 board adds +4 to the input numbering scheme as mentioned above, i.e if the first (leftmost) pot became input #20 (due to some previous DBX boards), the rightmost pot is #23, and next PTX or DBX board (connected to the right) will start with #24.

PTX4 potentiometer boards are not to be used as external potentiometers on additional DBX9 analog inputs. Use separate potentiometers instead.

Input assignment PTX4-25 and PTX4-35
PTX4 Pot	P1	P2	P3	P4		Next Board
Input #	+0	+1	+2	+3		+4...
P1 is the leftmost pot

Note: Next Board is assignment of first control of next module in chain (on right side of this module).

ANX8 Analog Input Module

ANX8 boards feature 8 additional analog inputs for connection of built-in potentiometers, drawbars, pitch/modulation wheels and other analog controls. Any number of ANX8 boards may be inserted anywhere in the MPX bus chain, with PL9 "NEXT BOARD" pointing to end of chain. A single ANX8 board adds +8 to the input numbering scheme as mentioned above, i.e if the first (leftmost) pot became input #20 (due to some previous DBX boards), the rightmost pot is #27, and next PTX or DBX board (connected to the right) will start with #28.

8 separate inputs are available on 3-pin headers PL1 to PL8. Connect pin(s) marked "REF" to end of potentiometer, pin "GND" to start, pin "AIN" to wiper.

Note: Next Board is assignment of first control of next module in chain (on right side of this module).

Input assignment ANX8
ANX8 Input	PL1	PL2	PL3	PL4	PL5	PL6	PL7	PL8		Next Board
Input #	+0	+1	+2	+3	+4	+5	+6	+7		+8...

For convenient wiring, analog inputs are also available in groups of 4 inputs (PL11 with inputs +0 to +3, PL12 with inputs +4 to +7):

Eingangsbelegung ANX8 PL11, PL12
ANX8 Input	PL11-1	PL11-2	PL11-3	PL11-4	PL11-5	PL11-6		PL12-1	PL12-2	PL12-3	PL12-4	PL12-5	PL12-6		Next Board
Input #	GND	+0	+1	+2	+3	REF		GND	+4	+5	+6	+7	REF		+8...

Chaining DBX6/DBX9/DBX12, ANX8 and PTX4

Connect first DBX6, DBX9, DBX12, ANX8 or PTX4 assembly to PL27. The leftmost control HX3.6 "sees" in the chain is external MPX analog input #0 (assigned by parameter #5024). The number counts up to the next DBX/PTX board connected to the daisy-chain connector. I.e. if you chain a DBX9 and a PTX4 (in this order), the leftmost (first) potentiometer on PTX4 becomes control #9, assigned by parameter #5033 (#0 to #8 used up by DBX9). Adding a DBX12 will start at #13, assigned by parameter #5037, and so on.

Your chain now looks like this:

HX3.6 PL27	cable	PL1/7 DBX9 PL3/8	cable	PL1 PTX4 PL2	cable	PL1/7 DBX12 PL4/8	etc.
Eingang #		0 1 2 3 4 5 6 7 8		9 10 11 12		13 14 15 16 17 ...

Note: PL1 (top left, bottom mounted) and PL7 are internally connected in parallel, as well as PL3 (top right, bottom mounted) and PL8. These connectors may be used alternatively (see HX3.6_Installation_Manual#Installation_Alternatives for details).

As mentioned before, DBX6, DBX9, DBX12 or PTX4 can be arranged in any order as long as they form a chain from one board to another. Parameter assignment always starts at #0 (parameter #5024) for the leftmost control in the chain. It is possible to skip individual drawbar inputs by setting its assignment parameter to "254 - Not assigned". This may be useful for empty spaces in the drawbar lineup, for example between harmonic and ADSR drawbars or upper and pedal drawbars. All DBX boards are available without drawbar potentiometers mounted, so you may configure them as required by your installation.

Typical Applications

A typical organ configuration (9 drawbars per manual, 3 for pedal) using DBX12 may look as follows:

HX3.6 PL27	cable	PL1/7 DBX12 with R16 (PL4/8)	(=)	(PL1/7) DBX9 PL3	cable	PL1 PTX4 PL2
Input#		0 1 2 3 4 5 6 7 8 -- 10 11 9		12 13 14 15 16 17 18 19 20		21 22 23 24

or, depending on installation (to keep cable length short):

HX3.6 PL27	cable	PL/7 PTX4 PL2	cable	PL/7 DBX12 with R16 (PL4/8)	(=)	(PL1/7) DBX9 PL3
Input#		0 1 2 3		4 5 6 7 8 9 10 11 12 -- 14 15 13		16 17 18 19 20 21 22 23

A H100-like installation may look like this:

HX3.6 PL27	cable	PL1 PTX4 PL2	cable	PL1/7 DBX12 with R13 (PL4/8)	(=)	(PL1/7) DBX12 with R13 (PL4/8)
Input#		0 1 2 3		4 5 6 7 8 9 10 11 12 13 14 15		16 17 18 19 20 21 22 23 24 25 26 27

Note: PL1 (top left, bottom mounted) and PL7 are internally connected in parallel, as well as PL3/PL4 (top right, bottom mounted) and PL8. These connectors may be used alternatively (see HX3.6_Installation_Manual#Installation_Alternatives for details).

Installation Alternatives

DBX boards may be chained (connected to each other) by using bottom-mounted 10-pin headers (left and right side of board), top-mounted 10-pin headers or wires soldered to solder pads. We supply 2 angled 10-pin headers with each board; you may use straight headers when space allows this installation.

Instead of using flat ribbon cables, adjacent DBX boards may be chained using solder blobs and 6 short pieces of wire (marked as "=" in table above) where boards "butt against each other". Solder pads on left and right sides provide easy connection from one board to next one by DGND, VCC5, SRCLK, SRIN/OUT ANLG and NRST pads (VREF3 remains unconnected, as well as additional potentiometer pads!).

Also boards may be cut along white lines if no space is allowed from one drawbar to next on different board. If needed, cut the board before mounting the drawbar potentiometers. The boards provide additional solder pads for chaining by wires even when board is shortened. However, the row's last DBX board should retain PL3 (DBX9) or PL4 (DBX12) as you may want to add more DBX or PTX4 boards in the future. Again, plan carefully before mounting drawbar pots or cutting boards!

Dual/Secondary DBX Drawbar Sets

Classic console organ installations mandate dual drawbar sets for each manual. Using dual drawbar sets with DBX bus system differs from old DB9-MPX installations. In DBX installations, all drawbars can be "seen" by the firmware, even the inactive ones (they are just skipped when drawbar set is not active). Set parameter #1503 to 3 (DBX mode) and assign all inputs which are primary drawbars with Upr1 or Lwr1 values, while secondary drawbars become Upr2 and Lwr2 values (128 and up).

Secondary drawbars will be activated when drawbar Voice preset on particular manual matches number in "System Inits" parameter #1505 (2ndDB Select Voice Number), otherwise they are skipped and primary drawbars become active.

Mixing DB9/DB12 and DBX Drawbar Sets

As internal inputs on PL31/PL32 can be used as drawbar inputs even in DBX configurations, existing DB9/DB12 and even DB9-MPX drawbars connected to PL31/PL32 (assigned by Analog Remap #5000 to #5023) can still be used, either as primary or secondary drawbar sets.

• When old DB9-MPX drawbar boards are connected to PL31/PL32 as secondary drawbar sets, set parameter #1503 value to 2 (DB9-MPX mode). In this case, do not use secondary drawbar assignments Upr2 and Lwr2 for inputs (parameter values 128 and up) in "Analog Remap" section; Upr2 and Lwr2 assignments will be ignored.

• When old DB9-MPX drawbar boards are not used, set parameter #1503 value to 3 (DBX mode). In this case, secondary drawbar assignments Upr2 and Lwr2 for inputs (parameter values 128 and up) can be used in "Analog Remap" section.

Connecting Digital Inputs

The HX3.6 system offers a total of 64 internal (logical) switch functions or "tabs" (e.g. "Tube Amp Bypass" or "H100 Keying Mode") as well as some special functions (from firmware 5.7, e.g. Transpose Up/Down). The HX3.6 mainboard provides 16 internal digital inputs onboard on PL35/36 (extendable by 5 external boards Preset16 or Extend16 up to 96 tab and preset functions) plus one rotary swich input. Switches are defined as tab stops, rocker or toggle switches, buttons are momentary switch contacts, normally open. All inputs are active low, i.e. tie to ground when switch/button is operated. You may leave the switch connectors open if you plan to control by MIDI only.

Input Monitor

A very helpful function of HX3.6 Editor versions is the Input Monitor. You can use it to check the function of all buttons and switches. Active (pressed) buttons are marked with "ON".

By clicking into the input table you will also find out to which HX3.6 tab the input or button is assigned. Conversely, when you click on an assignment in Switch Remap, the active field in the input monitor tables jumps to the assigned input.

Onboard Inputs PL35/PL36

The PL35 and PL36 connectors carry the 16 internal digital inputs; you can connect your own pushbuttons/switches or a Panel16 board here (see #Panel16). Many installations will get by with these 16 tabs.

Pinout PL35 PERC/VIBON/LESL
Pins	Pin 1	Pin 2	Pin 3	Pin 4	Pin 5	Pin 6	Pin 7	Pin 8	Pin 9	Pin 10
Input #	#32	#33	#34	#35	#36	#37	#38	#39	+5V	Gnd
Default function	Perc ON	Perc SOFT	Perc FAST	Perc THIRD	Vib ON Upper	Vib ON Lower	Leslie RUN	Leslie FAST	+5V	Gnd

Pinout PL36 PRESET/EFX/SPLIT
Pins	Pin 1	Pin 2	Pin 3	Pin 4	Pin 5	Pin 6	Pin 7	Pin 8	Pin 9	Pin 10
Input #	#40	#41	#42	#43	#44	#45	#46	#47	+5V	Gnd
Default function	Preset 1 oder V1	Preset 2 oder V2	Preset 3 oder V3	Preset 4 oder V/C	Reverb I	Reverb II	Bass On Leslie	Split ON	+5V	Gnd

Separate Buttons or Switches

Connection of buttons with LEDs on PL35 PERC/VIBON and PL36 PRESET/EFX/SPLIT. Use an R value of 1k for blue or white LEDs, as these LEDs are very bright.

Instead of Panel16 you can also connect your own buttons or tab switches (up to 16) directly to the HX3.6 main board. Each function is activated either by a button or a switch (depending on the parameter Button Mask in the system settings of the HX3.6 editor) at the digital inputs PL35/PL36. For buttons, a momentary contact with ground on each PL35/PL36 pin toggles the status and drives indicator LEDs (see schematic). For switches, the indicator LED can be omitted since the mechanical switch indicates the current state. Leave unused digital inputs open.

Panel16

Easiest solution for a register/stop panel is using our Panel16 board connected to PL35 PERC/VIBON/LESL and PL36 PRESET/EFX/SPLIT by two 10-wire flat ribbon cables. Panel16 provides 16 buttons for complete HX3 control; just add the rotary switch for vibrato depth.

Panel16 has 4 "Common Preset" keys in the layout for standard organ installations. The "Common Preset" keys are binary coded so that more than one preset key can be active (pressed simultaneously). This allows 16 key combinations (all off to all on) corresponding to Common Presets 0 (live) to 15. Alternatively, these keys can be used to select V1-V3 vibrato or C1-C3 chorus depth. In this case, the Vibrato rotary switch on PL24 is omitted; then set System Inits parameter #1497 to 2.

Default Button Assigment Panel16 on PL35/36
Buttons upper row	Perc ON	Perc SOFT	Perc FAST	Perc THIRD		Vib ON upper	Vib ON lower	Leslie RUN	Leslie FAST
Buttons lower row with vibrato buttons	V1	V2	V3	Vib/Chorus		Reverb I	Reverb II	Bass On Leslie	Split ON
Buttons lower row with preset buttons	Preset 1	Preset 2	Preset 3	Preset 4		Reverb I	Reverb II	Bass On Leslie	Split ON

Buttons used for Common Presets, Drawbar Voices or V1..V3 V/C may be remapped deliberately to any digital input using the Switch Remap table in the HX3 Editor application.

Other Buttons or Switches

To extend the pushbutton/switch inputs, the boards Preset16, Extend16 and also the older Preset12-2 are available. They are connected to PL26 PANEL on the mainboard and connected in series via a bus system (I2C). Each board forms a group of 16 inputs (2 x 12 for Preset 12-2). The MenuPanel is also connected to this bus; conveniently, it is placed at the end of the chain, since it has only one bus connector. It is also possible to press several 10-pin connectors onto the ribbon cable at PL26.

Each board must be assigned a unique bus address via its jumpers ($60 to $65, see imprint and table below). On older Preset16 and Preset12-2 the addresses are hardwired ($60 or $61 for Preset16 old, Preset12-2 occupies two addresses $60 and $61). Each address may be assigned only once in the network, otherwise there will be bus conflicts.

The 16 inputs of a Prest16 or Extend16 board form a group, with 5 boards these are the groups 0 to 5 corresponding to the set addresses $60 to $65. It is not necessary to number the addresses and thus the group numbers of the connected boards consecutively, there may be "gaps". HX3.6 does not query these.

All pushbutton/switches can be assigned to any HX3.6 function ("Tab") via the HX3.6 editor parameters Switch Remap; the parameters in the group Input Mode determine whether a switch (ON, 255) or a pushbutton with LED (OFF, 0, default) is connected to the corresponding input.

To check the function and affiliation of a digital input, use the Input Monitor in the HX3.6 editor. By clicking into the monitor table you can also determine to which HX3.6 tab this input is assigned.

Each digital input can be enabled/disabled or redirected in the Switch Remap section of the HX3 editor, parameters 5100 to 5195. Preset and voice buttons may also be distributed to the 96 inputs as desired. Only restriction: Buttons of a certain preset function (Upper, Lower or Common) must be located on continuous buttons within a group or board, it is not possible to distribute for example Upper Voices on 2 boards/groups.

Board Adresses for Digital Inputs

Input group 2 ($62) is already assigned for the 16 inputs on the HX3.6 mainboard (see below, section Panel16) and must not be used for external Preset16/Extend16.

Board Addresses for Digital Inputs
Input group	0	1	2 (onboard)	3	4	5
Bus address	$60	$61	$62	$63	$64	$65
Jumper on Preset16, Extend16	JP1, JP2, JP3 closed	JP2, JP3 closed	JP1, JP3 closed	JP3 closed	JP1, JP2 closed	JP2 closed
Note	Fixed addresses for Preset16 (old, Upper 0, Lower 1) and Preset12-2 (both)		HX3.6 board onboard, fixed address Do not use for Preset16, Extend16!	Extend16 und Preset16 with solder pads	Extend16 und Preset16 with solder pads	Extend16 und Preset16 with solder pads
Button-Funktion	Button #0..#15	Button #16..#31	Button #32..#47 (onboard, Panel16)	Button #48..#63	Button #64..#79	Button #80..#95
Button top left or first input	#0	#16	#32 (PL25 Pin 1)	#48	#64	#80

The number of a specific pushbutton/switch results from the group base number (16 * group/board number) plus the specified offset. So for the board with address $63 the first input would be 16 * 3 = 48.

Preset16

Two daisy-chained Preset16 boards connected to PL26 PANEL. MenuPanel may be connected to last Preset16 board.

Connectors and jumper locations of Preset16-2 board (new version)

Preset16 is a stand-alone panel with 2 rows of 8 LED buttons each. It is connected to HX3 PL26 via a 10-pin ribbon cable. Additional preset16 can be connected to the second 10-pin header each (daisy chain). Both 10-pin headers on preset16 can be used (are wired in parallel).

A plugged jumper on older Preset16 boards selects the upper manual, if available. If the jumper is missing, preset16 operates on lower manual. Newer preset16 boards have three jumpers (solder bridges) to set preset16 to upper or lower manual voice presets (address $60 and $61) (see table Board Addresses for Digital Inputs). Set solder pads to get one of the board addresses given in the table.

If you use two drawbars per manual, using DBX or older DB9-MPX (obsolete) drawbar cards, set System Inits parameter #1505 "2nd Drawbar Select Voice Number" to 1. This will activate the first drawbar set on preset 0, and the second drawbar set on preset 1. You can use any voice from 1 to 15 to activate the second drawbar set. Higher numbers will disable the switchover.

The board address may be arbitrary (except $62 for group 2), because the preset buttons are assigned via Switch Remap. However, $60 and $61 are preset in the firmware to remain compatible with existing installations. To achieve compatibility with previous installations, set bits 0 and 1 in *System Inits* "Various Configurations #1501, which swaps upper and lower button row of Preset16. Alternatively, move the gray button caps to the upper button row; they can be pulled off with some force. Set the Input Modes for groups 0 and 1 to pushbuttons or switches. The Switch setting can also be used with pushbuttons; in contrast to the Button setting, a voice preset is then called up as soon as the button is pressed and not when it is released, but saving is only possible with the help of the Cancel button (press > 2sec.). If necessary, define the Cancel key of the upper and lower manual in Switch Remaps and the voice preset for the second drawbar set in System Inits #1505.

Preset16 Default Button Assigment
Buttons upper row	Live setting	Voice 1 (or 2nd DB set)	Voice 2	Voice 3		Voice 4	Voice 5	Voice 6	Voice 7
Offset Input number	# +0	# +1	# +2	# +3		# +4	# +5	# +6	# +7
Buttons lower row	Voice 8	Voice 9	Voice 10	Voice 11		Voice 12	Voice 13	Voice 14	Voice 15
Offset Input number	# +8	# +9	# +10	# +11		# +12	# +13	# +14	# +15
Assignable via Switch Remap, can be on any board and in any group, but continuous buttons

Extend16

Extend16 switch extension

Connection of keys with LED indicators to Extend16, PL17 and PL18.

Extend16 boards are basically Preset16 without buttons; the connection of switches or buttons (possibly with LED) is done as described above for the on-board inputs of the HX3.6. The pinout of PL17/PL16 on the Extend16 board is compatible with PL35/PL36 of the mainboard. In addition, all pushbutton inputs are routed to 3-pin connectors. Extend16 can also be used to select presets if configured accordingly and then replace the older Preset12-2.

The number of the pushbutton/switch results from the group base number (16 * group/board number) plus the specified offset. For the board with address $63 (group 3) the first input would be 16 * 3 = 48.

Extend16 Pinout PL18
PL18 Pins	Pin 1	Pin 2	Pin 3	Pin 4	Pin 5	Pin 6	Pin 7	Pin 8	Pin 9	Pin 10
Offset Input number	# +0	# +1	# +2	# +3	# +4	# +5	# +6	# +7
Single inputs	PL1	PL2	PL3	PL4	PL5	PL6	PL7	PL8	+5V	Gnd
Extend16 Pinout PL17
PL17 Pins	Pin 1	Pin 2	Pin 3	Pin 4	Pin 5	Pin 6	Pin 7	Pin 8	Pin 9	Pin 10
Offset Input number	# +8	# +9	# +10	# +11	# +12	# +13	# +14	# +15
Single inputs	PL9	PL10	PL11	PL11	PL13	PL14	PL15	PL16	+5V	Gnd

For more convenient wiring, the LED pushbutton inputs are also routed to 16 three-pin connectors, to each of which an LED pushbutton is connected. If you use switches or pushbuttons without LEDs, leave the L+ connector open. Series resistors for the LEDs are already included here, you can connect red, yellow and green LEDs directly to PL1..PL16. For blue and white LEDs an additional series resistor of 1kOhm should be inserted into the L+ line, otherwise the LEDs are too bright and dazzle. Pin assignment PL1..PL16:

Extend16 Single Inputs
Pin	Function
BG	Button Ground
BL	Button and LED connection
L+	LED+ (Anode)

The board address may be arbitrary (except $62 for group 2), because the preset buttons are assigned via Switch Remap. However, $60 and $61 are preset in the firmware to remain compatible with existing installations. Set the Input Modes for groups 0 and 1 to push buttons or switches. The Switch setting can also be used with pushbuttons; unlike the Button setting, a voice preset is then called up when the button is pressed and not when it is released, but saving is only possible using the Cancel button (press > 2sec.). If necessary, define the Cancel key of the upper and lower manual in Switch Remaps and the voice preset for the second drawbar set in System Inits #1504.

Preset12-2 (obsolete)

The Preset12-2 is connected to HX3.6 PL26. The ribbon cable can be extended with an additional connector to connect the menu panel.

Preset12-2 is an interface board for up to 2 x 12 "inverted" preset keys (with optional LED indicators) as found on Hammond console organs. The Preset12-2 board is basically equivalent to two Panel16s or Extend16s, with the last 4 inputs missing. It is connected to the HX3.6 PL26 via a 10-wire ribbon cable. Pin 1 of the two 14-pin headers is preset 0 = Live (right drawbar set) = B button, pin 2 is preset 1 = Live (left drawbar set) and so on down to pin 12 = CANCEL button.

The standard organ firmware supports momentary contacts. To save a preset, press and hold the preset button/pushbutton for 2 seconds.

When using 2 Drawbar Sets per Manual by DB9-MPX Drawbar/Multiplexer and Preset12-2 board, set HX3 Editor "System Inits" parameter 1505 "2nd Drawbar Select Voice Number" to 1. Switching Drawbar Sets A#/B is only active when no Common Preset is on ("Live" mode #0). If a Common Preset (#1..#99) is selected, the right drawbar set is always active.

Pinout PL1 (LEDs)
Pin - Funktion
1: LED 1 cathode (Preset 0, "B" key drawbar set)
2: LED 2 cathode (Preset 1, "A#" key drawbar set)
3: LED 3 cathode (Preset 2)
...
12: LED 12 cathode (Preset 11, CANCEL key)
13,14: Common LED Anode (+)

The LED outputs have integrated 220 ohm resistors, resulting in an LED current of 15 mA. The long leg of the LEDs is the anode (+), the short leg is the cathode (-).

Pinout PL2 (Buttons/Switches)
Pin - Function (active low – switch to Gnd)
1: Switch 1 (Preset 0, "B" key drawbar set)
2: Switch 2 (Preset 1, "A#" key drawbar set)
3: Switch 3 (Preset 2)
...
12: Switch 12 (Preset 11, CANCEL key)
13,14: Common Gnd (0V)

To achieve compatibility with existing installations, set bits 0 and 1 in *System Inits* "Various Configurations #1501. This will restore the correct voice preset order. Set the Input Modes for groups 0 and 1 to pushbutton or switch. The Switch setting can also be used with pushbuttons; in contrast to the Button setting, a voice preset is then recalled as soon as the button is pressed and not when it is released, but saving is only possible using the Cancel button (press > 2sec.). If necessary, define the Cancel key of the upper and lower manual in Switch Remaps and the voice preset for the second drawbar set in System Inits #1505.

Preset12-MPX (obsolete)

The old Preset12-MPX boards for HX3 mk2/mk3 can also be used for HX3.6 together with two sets of non-MPX drawbar boards. However, they do not provide a variable preset number for the second drawbar set. Instead, the second drawbar set is hardwired to Voice Preset 15. So you must change the second drawbar set number in parameter #1505 to 15, not 1 if you are using Preset12-MPX.

To achieve compatibility with existing installations, set bits 0 and 1 in System Inits "Various Configurations #1501. This will restore the correct voice preset order. Set Input Modes for groups 0 and 1 to pushbutton or switch. The Switch setting can also be used with pushbuttons; in contrast to the Button setting, a voice preset is then recalled as soon as the button is pressed and not when it is released, but saving is only possible using the Cancel button (press > 2sec.). If necessary, define the Cancel key of the upper and lower manual in Switch Remaps and the voice preset for the second drawbar set in System Inits #1505.

Presets and Voices

HX3.6 knows for each manual and the pedal separately stored pure drawbar settings ("Voices") and the (depending on the System Inits configuration) many or all analog and tab settings "Common Presets" (1 to 99). Drawbar-Voices' (as found as "inverted keys" on B3 consoles) operate independently of Common Presets; they affect only Drawbar settings and can be accessed via the menu. 2x8, 2x12, or 2x16 Voice Presets can be created using the optional cards Preset16, Extend16 (multiple allowed) or Preset12-2.

If a common preset is called up and a voice preset is not set to 0 (live), the now invalid voice button flashes. Pressing the voice button again recalls the drawbar setting stored here; now the common preset button flashes to indicate that the common preset is no longer valid.

Vibrato Knob (Rotary Switch)

Vibrato rotary switch connection to PL33 VIBSW. Disregard "PL5" lettering in schematic. First contact lug of rotary switch is not used!

Vibrato/chorus V1 to C3 is selected by a rotary switch connected to PL33. The switch position is always polled unless Panel16 is configured with V1..3/Chorus buttons (System Inits parameter #1504, also see note below). PL33 also carries switching signals, indicating rotary operation. You may connect a LED with serial resistor (330R and up) here, cathode (-) connected to Common Gnd.

Pinout PL33 VIBSW Vibrato rotary switch (active low – switch to Gnd):

PL33 Vibrato Switch
Pin	Funktion
1	Chorus 1
2	Vibrato 2
3	Chorus 2
4	Vibrato 3
5	Chorus 3
6	not used
7	Rotary Slow Indicator (active high)
8	Rotary Fast Indicator (active high)
9	not used
10	Gnd

To assign vibrato keys, set the corresponding inputs in the Switch Remap section to 84, 85, 87 (three-key mode) or 84..87 (four-key mode). The System Inits parameter #1504 = 1 is ignored.

Connecting Keyboard Scan Board(s)

For lowest key-to-audio latency we recommend direct keyboard connection via scan board (different versions available). Scan boards are activated by update from SD card (appropriate for your application) or HX3.6 Manager. Upload driver scanmidi.dat, scanfatr.dat resp. scansr61.dat to HX3.6 using Updater window. All Scan drivers will support MIDI input/output too, but for pure MIDI remote we recommend MIDI input driver scanmidi.dat. New HX3.6 boards come with scanmidi.dat installed.

FatarScan2

FatarScan2 connection diagram - mk4 board shown, disregard PL indices, connection to PL8 FATAR SCAN

A single FatarScan2 board is connected to HX3.6 PL8 FATAR SCAN. One or two Fatar 61 key manuals (type TP/8O or similar) may be connected to one FatarScan2 board using a special cable set (MicroMatch connectors to keyboard scanning strips). See page Anschluss der Scan-Platine FatarScan2 (German language) for more pictures. We recommend buying the FatarScan2 cable set for connection to MicroMatch headers on Fatar keybeds (one set for each manual).

A FatarScan2 board must be connected to PL8 if using the FatarScan driver.

Bass pedals may be connected to an additional Scan16-Strip, Scan61-Inline or Bass25 board wired to PL12 4014 SCAN (!).

FatarScan2 boards are activated by update from SD card or HX3.6 Manager application. Upload driver scanfatr.dat to HX3.6 using Updater window.

Please note: The FatarScan2 board must be connected when using the scanfatr.dat driver, otherwise communication with the HX3.6 manager will be blocked.

Scan16-Strip Set

Connection of Scan16 Strip or Scan61 to HX3 board (HX3.4 pictured. Note: HX3.6 has different PL designators)

For most "one contact per key" organs one or two sets of tall Scan16-Strip boards (one set for each manual) may be used which yield easier installation on these keybeds. For each manual you need 3 (44 or 49 keys) or 4 (61 keys) Scan16 boards. Please refer to schematics and part placement in out Git repo. All Scan16 equipped manuals are wired in parallel with one 10-wire flat ribbon cable (multiple connectors attached) to HX3.6 PL12 4014 SCAN. Bass25 may be used as pedal scan board. A jumper on "lowest" Scan16 board determines if keybed is upper, lower or bass pedal:

JP1 = Upper manual
JP2 = Lower manual
JP3 = Pedal notes

Please note: lowest key contact pad on Scan16 is always "C" key on 4- and 5-octave keybeds. On 61-key manuals, upper part of rightmost Scan16 board may be cut off as marked on PCB silk screen printing (or pads are left open). On 44-key manuals, lowest 5 pads are left open, manual(s) start with "F" key. On 49-key manuals, connect pad PL20 to highest "C" note. All contacts must switch to ground. Boards provide ground lugs for connection to busbar.

Scan16 boards for one or two 49/61-key manuals is are activated by update from SD card or HX3 Manager application. Upload driver scansr61.dat to HX3.6 using Updater window. See page Anschluss_der_Scan-Platine_Scan4014-16_(je_16_Tasten) (german only) for pictures.

Scan61-Inline

Scan61-Inline Board connected to HX3 board

Scan61-Inline works exactly like a Scan16-Strip set of 4 PCB, but has all parts mounted on one compact PCB (one Scan61-Inline needed for each manual). So each key must be wired separately. Please refer to schematics and part placement in out Git repo. All Scan61 equipped manuals are wired in parallel with one 10-wire flat ribbon cable (multiple connectors attached) to HX3.6 PL12. Bass25 may be used as a third pedal scan board. A jumper on Scan61-inline board determines if keybed is upper, lower or bass pedal:

JP1 = Upper manual
JP2 = Lower manual
JP3 = Pedal notes

Please note: lowest key contact pad on Strip61-Inline is always "C" key. On shorter manuals, leave unused key inputs open. As on OrganScan61 or Scan16-Strip, all contacts must switch to ground. Boards provide ground lugs for connection to busbar.

Scan61-Inline boards are activated by update from SD card or HX3 Manager application. Upload driver scansr61.dat to HX3.6 using Updater window.

Bass25

Bass25 and Bass25 MIDI (top right) with own MIDI OUT and phantom supply

The Bass25 scan board (refer to PDFs in our Github repo folder PLATINEN/BASS25) may be used as an addition to FatarScan2, Scan61-Inline and Scan16-Strip boards for convenient connection of bass pedal contacts as pictured above (note different HX3 headers). The board may be placed in bottom of organ if 10-wire flat ribbon cable to HX3 or last OrganScan61 board does not exceed 1m. Please note jumper setting on Bass25:

• JP1 solder bridge, always open
• JP2 solder bridge if used with HX3.4 OrganScan61 (not supported on HX3.6)
• JP3 solder bridge if used with FatarScan2 on HX3.6 PL8 or Scan16 Strip on HX3.6 PL12

Bass25 provides in-line headers and a 26-pin flat ribbon cable connector for alternative connection of bass pedal contacts:

PL1 Bass25 key connection
Pin	Function
1	Lowest Note C
2	C#
...	further keys
25	Highest Note C
26	Common ground (busbar)

Instead of PL1, the keyboard contacts can also be connected to the inline pin headers PL2 to PL7 or to the solder pads in front of the pin headers (left pin PL2: lowest C). The 2-pin inline header PL9 also serves as common ground for the busbar.

JP3 and JP4 solder bridges must be closed.

Note: A third Scan16-Strip or Scan61-Inline board may alternatively be used for bass pedal instead of Bass25, using only the first 13 or 25 contact inputs. Set jumper JP3 on scan boards to enable them for bass pedal use.

Bass25 MIDI

Bass25 MIDI is equipped with an own MIDI controller and MIDI output jack. It is connected to the HX3.6 mainboard by 5-wire MIDI cable. Bass25 MIDI provides in-line headers and a 26-pin flat ribbon cable connector for alternative connection of bass pedal contacts. 2-pin inline header PL9 also provides common ground for the busbar.

PL1 Bass25 MIDI key connection
Pin	Function
1	Lowest Note C
2	C#
...	further keys
25	Highest Note C
26	Common ground (busbar)

Instead of PL1, the keyboard contacts can also be connected to the inline pin headers PL2 to PL7 on the solder pads in front of the pin headers (left pin PL2: lowest C). The 2-pin inline header PL9 also serves as common ground for the busbar.

JP3 solder bridge must be closed.

JP4 solder bridge must be closed if Bass25 MIDI is powered by phantom supply from HX3 board, left MIDI input jack (seen from back). MIDI phantom power jumpers on HX3 board must be inserted.

For separate power supply (internal +5V or external 9V DC wall wart), open JP4 solder bridge. Use 2-pin header PL12 next to MIDI OUT jack to supply internal +5V: Pin 1 (left, facing towards diode) is VCC +5V, pin 2 (right) is ground (refer to PDF schematics in our Github repo folder PLATINEN/BASS25).

A +5V MIDI phantom supply on outer pins of MIDI input may be obtained from HX3 mainboard by inserting two additional jumpers on HX3.6 PL20 pins 7-8 and 9-10. Do not install these jumpers if connecting other MIDI gear not using a phantom supply.

Extension Board

The HX3 Extension Board mk5 is available for Leslie and headphones connection. It is compatible with HX3.6.

The old Extension Board for HX3.4 (mk3/mk4) may be used after removing two resistors from the Extension Board and soldering two wires on the rear side of the HX3.6 mainboard from Extension Board connector to serial port.

See page HX3.5 Extension Board for details.