The Faderwave circuit has these components and features:

• ItsyBitsy M4 or RP2040 microcontroller dev board is the brains of the circuit and provides the audio output. Power and USB MIDI come into the system via the ItsyBitsy USB port
• 3.5mm TRRS breakout (with optional RC filter circuit) allows you to connect the audio output to an external amp/powered speaker
• Two ADS7830 8-channel 8-bit ADC boards read the sixteen 10k slide potentiometers and send their values over I2C to the ItsyBitsy
• 1.3" OLED display running over SPI provides a settings menu
• Rotary encoder with push button is used for menu settings selection and entry
• Optional AD5693R 16-bit DAC board can be used to send control voltage to vintage/modular (e.g., Eurorack) synthesizers for alternate projects

PCB Design

While it would be possible to wire up the Faderwave using protoboards or breadboards, it would be a pretty wild mess of wires, so it made sense to design a PCB for it instead.

I used KiCad to lay out the circuit schematic, using the Adafruit Eaglecad part symbols imported and edited to serve the purpose. I also imported the Adafruit Eaglecad part footprints for the PCB layout.