features question (advanced?)

[popRocket]

I've been into my Local Comp USA (no apple store near me) and played around with SoundTrack and GarageBand. They seem totally sweet, but I could not figure out how to:

– change key mid-song (so the whole song isn't in the same key)
– change time signiture mid song (so the whole song isn't in the sig)
– apply filters / volume effects to multiple tracks at once (and control them as a group)
– play a loop at a "double-time" tempo (a "high hat" loop at 240bpm in a 120bpm song)

Are any of these possible?

 

[Ratboy]

1) To change the key mid-song, instead of repeating the current loop, make a copy of it. In the lower edit panel, use the transpose slider to adjust the key.

2) It is not possible to change the time signature mid-song.

3) I haven't found a way to do that either.

4) Strike three. Although, I suspect that there may be some round about way of doing it. Maybe posting the question to Apple's forums would yeild an answer.