Thx!! So I guess I could use a 3.3V zener diode and a schottky diode for the negative range?
Little Update here:
I found a dual output dc converter that I hooked up to the 5v axoloti pins to generate +-9v for the GK.
Officially the GK takes 7V but seems to be working fine on 9v.
The Bass patch works great so far, although I need to work on my priority/string detection logic.
Next will be to use the pot and the swtiches on the GK to do Subbass volume and patch changes.
I measured that the pot puts out 6.5V when open. Way too much for axoloti. How would I scale this down?
I found this in the Euxoloti thread. Would it work for this application? Does anybody know which value r3 has to have for scaling down 6,5V to 3V?