* **pure_adsr**: Alternative firmware for the old GMSN Pure ADSR modules, using ADSR and AR modes from Peaks and a weird tides-ish thing on mode 3
* **stereo_mix**: a 4 channel stereo (input AND output) mixer with voltage-controlled panning and volume. Digitally controlled via Multiplying DACs (MCP4922 in combination with MCP4822)