The Raspberry Pi lacks analog input pins, so we'll have an ADC (analog digital converter) board come to the rescue. The CYBERDECK and STEMMA QT make it easy to add, and CircuitPython + OSC + Sonic-Pi make it rad.
How stupid is this idea? 16 rotary encoders, 64 buttons and lots of LED rings. : r/synthdiy
Building a distributed MIDI Controller with Android Things and Nearby API #2, by Tomasz Rykała
Audio Injector Sound Card for The Raspberry Pi with inbuilt Microphone : Electronics
Pianoteq 7 on Raspberry Pi 400 -- with iPad as interface! (Page 1) - Pianoteq user forum - Modartt user forum
The DACBerry 400S is the first DAC designed specifically for the Raspberry Pi 400, providing high-quality audio output and a 3.5mm audio
DACBerry 400S Audio Card for Raspberry Pi 400
Raspberry Pi 400 GPIO Adapter - SB Components SKU21239 Botland - Robotic Shop
How to Use Potentiometers on the Raspberry Pi - Circuit Basics
Overview, Analog Knobs on Raspberry Pi 400 with CYBERDECK Hat
Raspberry Pi 400 is a Personal Computer
Raspberry Pi 400 is a Personal Computer
Overview, Analog Knobs on Raspberry Pi 400 with CYBERDECK Hat