Basic code to take a Teensy 4.1, Audio Shield, and Novation Launchpad MK2 into a standalone hardware drum machine.
Build Log: https://youtu.be/IPCSpjDEtMA
Important things.
Filenames MUST be short (<8 characters IIRC), ALL CAPS, and 16-bit WAV. if it doesn't work, try importing and exporting from Audacity.
Pin 40 is where sync in connects.