Using microphone instead of accelerometer is much better but this is just primitive setup and also the delay is ~23ms. Not to mention that it also picks up unrelated sounds. Using dedicated device (esp32) + piezos will be much better. At least I had fun working on this.

First just detect peaks and then I would like to have some sort of drum rudiments trainer 😀 

It won’t be so easy to implement properly using the microphone (also when you consider a possible metronome sound output).

Looks cool, what is it supposed to be doing?