That is essentially why I stopped using HuSIC. It gets too crazy.
You really only need the note portions near the bottom.
The rest is setup/waveforms/envelopes.
Squirrel doesn't support envelopes quite yet, but will soon.
In its current format, you need only set up each channels parameters (song1inits.c). Its commented enough to follow through.
Did you read the tutorial in the archive? I think it covers it pretty good!
You basically need to just strip out the note information, and if you would like, add those specific waveforms he has into waveloader.c either by appending them to the list, or replacing some.