Legacy Board

LegacyBoard connection to HX3.7 Mainboard

Usage

As HX3.7 does no longer offer legacy analog and switch inputs, the HX3.7 LegacyBoard is available to connect existing passive switch/button boards like Panel16 (2x8 = 16 inputs, two 10-pin headers), analog drawbar controls (2x12 = 24 inputs, two 16-pin headers) and a 6-way rotary vibrato switch (10-pin header). It provides the box headers of previous mainboards for up to 24 drawbars, 16 buttons/switches and vibrato rotary switch. The LegacyBoard is not needed for new installations using the MPX bus/connector (all DBX/PTX/ANX boards). LegacyBoard PL1/PL5 connect to HX3.7 PL31 PANEL I2C and PL32 ANLG MPX box headers as seen in picture. Route-through box headers (PL4/PL10, right) are provided for both, allowing easy daisy-chaining to MenuPanel or additional input boards.

Connection of analog and digital controls to HX3.7 LegacyBoard is made in the same way as for HX3.6 internal analog inputs and HX3.6 internal digital inputs:

• Connect old-style drawbars, old DB9/DB12/DB9 MPX drawbar boards or potentiometers to PL2 ANLG UPR and PL3 ANLG LWR of HX3.7 LegacyBoard
• Connect old Panel16 or buttons/switches to PL7 and PL8 of HX3.7 LegacyBoard
• Connect vibrato rotary switch to PL6 of HX3.7 LegacyBoard
• Insert jumper JP1 and JP2

Please note: On HX3.7 LegacyBoard, the internal analog inputs PL2 ANLG UPR and PL3 ANLG LWR are emulated by external analog MPX inputs (starting at param #5024 in HX3 Editor). Analog input assignments #5000 to #5023 do not exist on HX3.7, even with LegacyBoard connected. The parameters #5024 to #5047 are responsible instead. Set parameter #5000 to 255 (end of table marker) to avoid floating values.

Analog Inputs

Connecting Drawbars to PL2 and PL3

Drawbar and pot connection to PL2 and PL3 (click picture to enlarge)

PL2 and PL3 are compatible with the old DB9 and DB12 drawbar boards. You can also use your own or existing drawbars. The resistance value should be in the range of 10 kOhm, linear taper (for example, type B10K). Please note that the use of drawbar potentiometers with a logarithmic characteristic curve, as found in various older LSI and transistor organs, will not result in correct volume and drawbar position on the menu panel.

Each analog input can be “soft-wired” (assigned) to any analog function in the “Analog Remap” section of the HX3 Editor. By default, analog functions may be assigned to maintain HX3.4 compatibility as follows:

PL2 ANLG UPR - Control Voltages Upper
Pin PL2	Parameter	Default Function
1	5024	Upper Drawbar 16
2	5025	Upper Drawbar 5 1/3
3	5026	Upper Drawbar 8
4	5027	Upper Drawbar 4
5	5028	Upper Drawbar 2 2/3
6	5029	Upper Drawbar 2
7	5030	Upper Drawbar 1 5/9
8	5031	Upper Drawbar 1 1/3
9	5032	Upper Drawbar 1
10	5033	Master Volume Pot
11	5034	Amp Gain Pot
12	5035	Assigned Potentiometer
13, 14		Drawbar/Poti gemeinsame Masse GND
15		Drawbar set A/B switching signal
16		Drawbar/Poti End 3.3V+ (Reference)

PL3 ANLG LWR - Control Voltages Lower
Pin PL3	Parameter	Default Function
1	5036	Lower Drawbar 16
2	5037	Lower Drawbar 5 1/3
3	5038	Lower Drawbar 8
4	5039	Lower Drawbar 4
5	5040	Lower Drawbar 2 2/3
6	5041	Lower Drawbar 2
7	5042	Lower Drawbar 1 5/9
8	5043	Lower Drawbar 1 1/3
9	5044	Lower Drawbar 1
10	5045	Drawbar Bass 16
11	5046	Drawbar Bass 8
12	5047	Drawbar/Poti Bass Sustain
13, 14		Drawbar/Poti gemeinsame Masse GND
15		Drawbar set A/B Schaltsignal (kann mit Pin 16 verbunden werden)
16		Drawbar/Poti Ende 3.3V+ (Referenz)

Digital Inputs

"Classic" Buttons/Switches on PL7 and PL8

Connection of buttons with LEDs on PL7 PERC/VIBON and PL8 PRESET/EFX/SPLIT. Use an R value of 1k for blue or white LEDs, as these LEDs are very bright.

Box headers PL7 und PL8 carry 16 digital Inputs (former "internal" or "onboard"); You can connect your own buttons/switches or an old Panel16 board (without I2C) here. Many installations will be able to manage with these 16 tabs.

Pinout PL7 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

Pinout PL8 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

Separate Buttons or Switches

Instead of Panel16 you can also connect your own buttons or tab switches (up to 16) directly to the LegacyBoard. Each function is activated either by a button or a switch (depending on the parameters Input Mode in HX3 editor) at the digital inputs PL7/PL8. For buttons, a momentary contact with ground on each PL6/PL8 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.

Vibrato Rotary Switch PL6

Vibrato rotary switch connection to PL6 VIBSW. Disregard "PL5" lettering in schematic. First contact lug of rotary switch is not used!

Optional LED indicators for active drawbar sets

Vibrato/Chorus V1 to C3 is selected using a rotary switch connected to PL6. The switch position is always queried unless a Panel16/Extend16 is configured with V1..3/Chorus buttons (System Inits parameter #1504). PL6 also carries switching signals that indicate the selection of drawbar set A or B. You can also connect indicator LEDs with series resistors (330 ohms and higher) as shown below. If no input is grounded, V1 is selected.

Pinout PL6 VIBSW Vibrato rotary switch (active low – switch to Gnd):

PL6 Vibrato Rotary Switch
Pin	Function
1	Chorus 1
2	Vibrato 2
3	Chorus 2
4	Vibrato 3
5	Chorus 3
6	unused
7	Upper A/B select Output (High = Secondary DB set)
8	Lower A/B select Output (High = Secondary DB set)
9	Vcc +5V
10	Gnd

OEM Preamp/Ctrl Output PL9

Optional PL9 control output is available on OEM request (U13 and PL9 not populated on standard HX3.7 LegacyBoard). If U13 and PL9 are installed, remove jumper JP1 and JP2. This OEM Control Port provides the following signals on 7 outputs (high level = active):

PL9 OEM Control Port
Pin	Function
1	Upper A/B select Output (High = Secondary DB set)
2	Lower A/B select Output (High = Secondary DB set)
3	Leslie/Rotary RUN (LED+)
4	Leslie/Rotary FAST (LED+)
5	Reverb I (LED+)
6	Reverb II (LED+)
7	unused
8	PowerGood/AudioEnable (LED+)
9	Vcc +5V
8	Gnd (LED-)

To use the OEM Control Port PL9, firmware #7.050 and up must be installed. LEDs can be connected directly if a series resistor (e.g., 470 ohms for red LEDs) is provided for each LED.