Here's the schematic (from Audiotec-Fischer) useful for makin your own remote controller compatible with the DSP's from Helix (P-DSP and C-DSP) and Brax (NOX4 amplifier built-in DSP).
Apparently this thing is A MUST if you have only one sound source, you connect it thru the optical fiber and you would like to control the volume level of your system 
You will need a 10k Ohm linear potentiometer (or 2 if you'd like to have the sub control too) and a 12pin male "Micro Match" type connector (1.27 mm pin threshold)
Most potentiometers will have 3 connectros they're A C B no matter from which side you look. (but remember they will work "from the left to the right" for the side you looked from 
) so... you connect:
A) +3.3V
C) control signal (main remote / sub remote)
B) ground (masse)
Of course you can have the + and - "bridged" till your potentiometers - so for two pots you'll need 4 wire cable.
Helix DSP Remote Controller Schematic.jpg
DSP Level Regler.pdf
If you'd have any problems with locating the pin numbers - here's explanation.
Pinning MicroMatch Control Input.pdf
I still don't know what the "Switch" connectors are for. Will post an update when find out (I believe they are for swithing between 2 saved configs but I'm not sure yet)
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