Is there any way to speed up or slow down / change the original bpm gradually on a ramp from slow to fast or from fast to slow on individual instrument tracks instead of the whole bmp project?
Not really. But I think there is a way to get what you’re after.
I’d probably use Save As… first and do this in a separate version of the Project.
- Set up the Tempo Track to speedup & slow down all the Tracks
- Render In Place only the Tracks you want to have the Tempo variations
- Back in the main version of the Project, Import the Rendered Audio into the Pool
- Make sure that Musical Mode is NOT enabled on these files