So if I'm using sin bass, how would I go about stopping all music that's playing? As in, a replacement for sound_stop_all(). The only way I can see is stopping each stream individually, and that would be a pain to do.

You see, I want to switch to oggs for Abducted Toad, but the way I'm handling the playing of music is by having an obj_musicplayer that, in the room start event, checks if its music (defined in the creation code) is playing, and if not, it does sound_stop_all() and plays its music. Any idea how I could do this with sin bass?

You could write an script called music_stop() to stop them all.