Here's a quick run-down of some of the things you can waste your time on
Each digit is a different instrument; the 1's slot is a drum kit, the 10's are bass, 100's are a vibraphone...
Each number selects a different track for the instrument of that digit
Combine the different tracks however you like! There are one billion possible combinations, can you hear them all?
Can you beat my high-score of 32? I can't see why not. Switch on game mode, watch the second readout and try to make the top one the same before the loop comes around