Arduino Nano with Auduino Code through an OPA134 with 10 times boost and a slight distortion at the last 25%
Powering by +5V & +/-12V

No reverse polarity protection and no CV ins. If you want some Frieduino plug the power cable wrong ways 😀 This must be solved in the next step.

The arduino can’t handle negative current so it´s necessary to do some DC offset!!! Diodes …

Pretty funny so far and still firmware upgradable.

The next panel will be printed, well drilled and with 9mm pots!!!! Why not putting an active filter section into …

Maybe it´s time for some DIY-PCB experiments ….