[Patashu]

BPM CHANGES AND STOPS
Bpm tricks are cool. Often songs will have a point in them where noise dramatically drops or nothing at all is playing; these are good places to put pauses. Figure out the length the pause lasts for in beats, then subtract anywhere from half of that to a beat or two (since arrows can't come instantaneously after a pause ends). Multiply this number by 60 then divide it by the song's BPM; this is how long the pause will be. Raise and lower the pause's value with F9 and F10 (again, hold Alt for smaller increments) and you're done. If you insert a pause after stepping after it, the arrows will be too far away now; go just after the pause and use the Delete key to remove blank bars until they're at the right distance.

It's possible that a complete pause in a song may last for a duration that isn't a number of beats; if so, just fine-tune the stop's length until the arrows that come after it are on-beat once more, and lower the rate to 0.3x afterwards with assist tick on just to make perfectly sure.

Bpm changes are simple: Find a point where the song sounds faster/slower, use F7/F8 to bring the BPM to double or half of what it originally was, then go to the end of this fast/slow portion and raise/lower the BPM back to what it should be. If it gets reaallly slow or fast you could even resort to a quartered or quadrupled bpm. And whatever you do, don't insert a bpm change that looks bad/unneccesary when playing the song, and make sure it actually syncs up with the song well.