Visualizing Super Mario Bros. 2's music engine

Here's a video with a script I wrote that visualizes some of how SMB2's music engine works.
The offset at the top left is the current music pointer; the information below that is Square 1, 2, Triangle, and Noise. DPCM isn't on here yet, because I kinda forgot about it and it's like 2 in the morning.
Each channel has its own offset after the main music pointer, and it looks like channels can choose to "loop" that segment. Square 1 seems to be the master control, choosing when to move onto the next segment.
Some of these overlap, but this script isn't sophisticated enough to show that yet.

[@yablock7346]

red and green : pulse/square (piano) cyan : triangle (bass) blue : noise (percussion)

[@DragWx]

Fun Fact: all three SMB games on the NES share this same music engine, although from SMB to SMB2 to SMB3, the music engine went through some revisions and had features added. Still, the same general concept of how the music engine works, the format the track data is in, and all of the associated quirks is shared between all three games.

[@sails9311]

this is hella frickin neato

[@Bisqwit]

Pretty cool visualization!