Just some neat stuff I've figured out so far messing with the custom instruments feature in p8 v0.1.11.
Featuring: Claps, (swung!) hi-hats, record scratches, and some other weird stuff.
Here's a cart containing all the music data from my recently released game "地獄・Hell", an entry into the "A Game By Its Cover 2017" jam on itch.io. The game itself was designed to run in (a slightly modified version of) picolove, and takes advantage of some of its nonstandard features, and thus I can't post the full cart here.
Interesting note: picolove's reimplementation of PICO-8's sound engine isn't perfect, so the sound ends up having a somewhat different character. In particular, the difference in the way the fast arpeggios behave (especially in track 26) is quite noticeable.