In the world of homebrew synthesizers, there are plenty of noiseboxes and grooveboxes that make all kinds of wacky and wild noises. However, common projects like the Auduino and Atari Punk Console are often limited in that they can’t readily be programmed to play multiple notes or any sort of discernable rhythm. Nick Poole changes this with his “Auduino” step sequencer build.
https://www.youtube.com/watch?v=SOdLgG8tXgs
The module consists of 16 potentiometers, 8 buttons, 8 red LEDs, all controlled by an Arduino Mega which reads the commands given by the user and modulates the output sound on digital pin 3 connected to a 3.5mm female jack accessible from the external.