Pitch Shifting with the Arduino Audio Tools - Phil Schatzmann
Arduino Realtime Voice Changer - YouTube
Why has nobody made a quick and dirty pitch-shifter for the arduino? - Audio - Arduino Forum
Poly Effects on X: "Firmware 2.49 is up, with 2 new modules and some improvements. I've added a basic quantizer so you can quantize the LFOs/step sequencer to pitches and a controllable
Guitar pedal - alter frequency - Audio - Arduino Forum
Build Your Own Real-Time Voice Changer with an Arduino and Audio Hacker Shield - Hackster.io
Stefan Wagner's ATtiny Voice Changer Is a Compact Open Source Toy for Pitch-Shifting Audio - Hackster.io
Vocal pitch shifter coding help- converting from Uno to Nano : r/arduino