Simple but great idea! Boy, how I wished HyperCard made it possible to have multiple instruments playing at the same time and get chords :3
Thanks for making this!
It does support multiple channels, I'm not sure how they sound though.
Interesting! Did you find some documentation describing how to work with multiple channels? I might do a post-jam update :3
Check that out http://folkstream.com/muse/teachhc/hcsound/hcmusic.html
