I recently updated to GarageBand 10.0.2. When I try to transpose something, the little slider does not move. In the old GarageBand, control+option+G solved this problem, but that's not working now.
In theTrack Editor for the Audio track:
Have you enabled selected a region in the Track, selected the "Region" tab, and enabled "Follow Tempo & Pitch"? Otherwise the "transpose" slider will be greyed out.
For some prerecorded audio files the Transpose slider will not work reliably. I found no clear pattern, when it does and when not.
If all fails, create a loop from the audio file. Select the region in the track and use the command "File: Add region to Loop library".
Set the current key and tempo, name the loop, and save the loop.
Now add it from the loop browser to a new track and delete your old track. The search field in the Loop browser will help you to find the loop quickly.
You will be able to transpose the sample as described above, like a regular loop.
For example - a audio file turned into a loop and transposed:
Why is the transpose function not working?
