Quantity   Component name
1 × Analog mixer Disco mixer rescued from a resycling center. Can be anything with analog potentiometers.
1 × Raspberry Pi Pico
2 × Rotary Encoder KY-040
3 × MCP3008 8-channel ADC with SPI
1 × 3.3V power supply
1 × USB sound device (optional) USB sound card with USB hub (powered)
1 × Linux host with pulseaudio (pipewire)