Build Guitar Pedal Using Arduino UNO
https://maker.pro/arduino/projects/arduino-uno-guitar-pedal
pedalSHIELD UNO is an Arduino UNO programmable guitar pedal. You can create your own guitar effects and digital sounds.
How to Make a Programmable Guitar Pedal With Arduino
https://maker.pro/arduino/projects/arduino-diy-guitar-pedal
Use an Arduino to make your own programmable guitar pedal and add effects like distortion, fuzz, and more to your music.
ECH83 Guitar Preamplifier with Tone Control on 12V DC
https://maker.pro/analog/projects/ech83-guitar-preamplifier-with-tone-control-on-12v-dc
Simple single tube preamplifier with tone control that includes options for adjusting the bass, midrange, and treble frequencies. It also has gain, volume, and input sensitivity controls.