HX3 mk3/mk4 additional info
New HX3 mk3/mk4 boards are equipped with stereo Leslie® simulation, secondary MIDI input and configurable mono audio output jacks.
On factory default for HX3 mk3/mk4, menu item "Jack Config A" yields bass pedal on left (inner) audio jack, plain organ signal (like G-G on B3 AO28) on right (outer) audio jack. "Jack Config B" yields stereo Leslie® simulation on both jacks with added dry bass pedal signal. Both configurations may be changed to any combination with "AudioJ Conf A" and "AudioJ Conf B" menus (scroll down to access).
Jumpers JP5 und JP7/8 (I2C_REV) must be removed during operation - only needed for factory programming. JP6 must be set to REF position (not on HX3 Expander).
HX3 mk3/mk4 has an auxiliary connector PL8 behind the audio jacks which carries auido signal as present on jacks. Similar, two connectors PL18 and PL19 are swell (SWL) and footswitch inputs (connected to control jacks) for internal use.
PL16 (not installed) might be used for future use.
HX3 mk3/mk4 Tab/Switch Connection
HX3 mk3/mk4 does not have additional tab switch inputs PL8/PL12 with same functiononality as button/LED inputs PL7/PL11. Instead, button/LED toggle pins on PL7/PL11 may be configured individually as switch inputs by HX3 Remote software, Organ Defaults parameters 478 and 479. A checked box indicates a switch input, an unchecked box means a toogling button/LED input. Default is toggle inputs for Panel16 or button connection.
For other connectors, see page HX3_Board_Installation.
HX3 mk3 boards have a spare footprint U12 for an additional PCA9554AD I2C port circuit which may be used to control external preamplifiers etc. If populated (standard on mk4), PL17 carries following signals (active high) with firmware #3.6 and up:
PREAMP_DBSELECT_UPPER Pin 1, Drawbar A/B Select for Upper Preset 1/15
PREAMP_DBSELECT_LOWER Pin 2, Drawbar A/B Select for Lower Preset 1/15
PREAMP_LESLIE_RUN Pin 3
PREAMP_LESLIE_FAST Pin 4
PREAMP_REV1 Pin 5, Reverb I
PREAMP_REV2 Pin 6, Reverb II
PREAMP_OD1 Pin 7 (not used)
PREAMP_OD2 Pin 8 (not used)
HX3 mk3 Secondary MIDI Input
Both MIDI DIN jacks are wired by internal jumpers as MIDI inputs with merge as pictured. Please disregard lettering on old HX3 MIDI expander back panel. You may use a MIDI master keyboard and a additional MIDI keyboard or MIDI drawbar controller. Original MIDI OUT configuration may be obtained by internal jumper setting. Also, MIDI phantom supply may be routed to left MIDI input by placing two additional jumpers.
Phantom supply on secondary MIDI IN may be enabled by placing one jumper to two rightmost pins of PL6 and one jumper on JP13. When phantom supply jumpers are installed, DIN jack carries ground on middle pin and +5V on two otherwise unused outer pins.
Factory default for "MIDI Custom CC" set is Nord C2 organ (works also with Ocean Beach DB-1 drawbar controller); all MIDI controller assignments may be changed by HX3 Remote application (USB adaptor cable required) to any desired value.
HX3 mk3/mk4 Firmware Update
On HX3 mk3, no additional jumpers must be installed for updating with HX3 Remote application. Please use HX3 Remote application contained in firmware update ZIP.
HX3 MIDI Expander: To access internal configuration port with FTDI USB adaptor cable, please unscrew front panel and remove top lid. MenuPanel should be left connected to view messages on display.
HX3 mk4 Changes
HX3 mk4 has some minor changes compared to mk3:
- Preamp control circuit U12 is alsways populated
- Jumper setting for left MIDI OUT is 1-2, 4-5 and 7-8 on PL26 (3 jumpers, leftmost pin is 1)
- For +5V phantom supply on MIDI IN set additional jumper on pins 9-10. Phantom voltage is present on both DIN jack outer pins, ground on middle pin.
- Jumper setting for left MIDI IN is 2-3 and 5-6 on PL26 (2 jumpers, same as second pic)
- PL14 has internal pullups so using FatarScan core with no scan board attached will produce noise
