You could delete the entire last line of #5 as it won't play at all (It should play after all the other channels have finished but then the song just loops). So those are basically 6 wasted bytes (Or I'm wrong with my thoughts^^)
Then you have a r1^1^1^1 in channel #0, which can be transformed into an [r2]8. This saves 1 byte. (Or I'm wrong again^^)
Lastly, you can save a few additional bytes by converting every [r1]-loop into a [r2]2-loop. This saves 1 byte every time.
So much text because of 0xB bytes. But you asked me to