6 HX3.5 Mainboard
Jack Connections
HX3.5 mainboard jack connections from left to right:
SWELL PEDAL ¼” stereo jack: Expression pedal input is compatible with Yamaha FC-7 and
similar expression pedals. Plug connection: Sleeve = ground / potentiometer start, ring =
potentiometer tap, tip = potentiometer end. Expression may also be remote-controlled by MIDI
control change.
FOOT SWITCH ¼” stereo jack: Single or double footswitch controls simulated rotary speed:
SLOW/FAST on plug tip, RUN/STOP on plug ring. Please use latching foot switches;
momentary (button type) switches are not supported. If single footswitch used, Rotary is
always on RUN (no plug ring, input grounded by plug sleeve).
USB USB B-type connector for MIDI over USB, updates, parameter editing. USB port and
MIDI IN/OUT cannot be used at the same time.
MIDI IN/OUT Factory default secondary MIDI input for additional lower manual, bass pedal or
MIDI controller. Optionally jumpered to supply +5V/200ma to our Drawbar Controller (phantom
voltage) or pedal scan board Bass25. May be changed to act as MIDI OUT by internal jumper
swap. See HX3.5 Installation Manual for details.
MIDI IN Primary input from MIDI keyboard.
DC IN: Use stabilized DC wall wart 9 to 12V with at least 500mA current output, inner/outer
plug diameter 2.1/5.5 mm on DC input jack. Polarity: positive voltage on inner tip.
AUDIO1/AUDIO2: Main audio stereo output. Output level is approx. 300 mV at full swell.
For control of parameter settings, we recommend the use of our MenuPanel. Installing the menu
panel and other peripherals is described in the HX3.5 Installation Manual. The menu system for a
standard organ configuration, using drawbars, our Panel16 switch button board, and keybeds
connected through our key scanning boards is described below.
Please note: Factory default programming is the HX3 MIDI Expander firmware. You may set up
the HX3.5 mainboard conveniently for your organ configuration by means of the HX3.5 Editor. See
the HX3.5 Manager User Manual for details. All software, documentation, and manuals are
available online on keyboardpartner.com in section Support & Download.
Swell Pedal/Volume Control
Output level of all output channels is controlled by Master Volume setting in menu or MIDI CC #7
“Volume”, whichever occurs last.
Organ's swell pedal position is controlled by an expression pedal or MIDI CC #11 “Expression”,
whichever occurs last. HX3 resembles a loudness curve similar to the swell pedal of a classic
tonewheel organ, so expression volume will not reach zero. We recommend connecting an
expression pedal Yamaha FC-7 or similar (1/4" jack, 10k to 47k total resistance) directly to the
HX3 module. By using an expression pedal rather than MIDI sweller control will be faster and
more precise.
MIDI CC #11 and #7 may be changed by menu to other valid MIDI CC numbers.
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