Awesome idea, really fun to play around with! I'm not a music guy and know nothing about scales/ chords so I was going in blind, but still ended up creating an interesting rhythm.
It's a really simple system, but it enables the creation of complex music! Letting splitters create infinite sound-byte loops lets you create separate 'tracks' too! Someone far more clever than I could really make something awesome with this.
Nice job!
Also: I think there must be another tutorial message after you run out of sound-bytes, but I couldn't trigger it no matter how many extra sound-bytes I placed.