&pajama day 7 - That's a wrap! I got multi-track recording and playback working, complete with independent per-track instruments. There's still a ways to go before this is useful - I'd want midi export and at least some basic track editing - but it was a lot of fun to see how much progress I was able to make in a week. I'm also happy with my project choice for this jam, the immediate gratification of being able to (kind of) make music at increasing levels of sophistication kept me motivated. I'm certainly hoping to keep the momentum going and work on it further in the coming weeks.