You're asking about the audio track in Biab? That answer is no. Not to be too obvious but if you're asking about simply changing tempos in a regular Biab song, it will regenerate the RT's as audio no problem.

If you have prerecorded audio tracks you can pitch shift or stretch them in Real Band. You don't want to go too far with that but if the original track is 100 BPM and you need 108 or 90 that should be no problem.

I think the procedure would be to start with a new project in RB. Say you want 108. Set the tempo to 108 then import your audio track that's at 100. Once imported you open it in the Audio Edit window and stretch it to 108. Now you can start recording or generating new Biab tracks at 108. If you have some Biab tracks already done at 108, just import those in, no need to create them again.

RB has 48 tracks to play with so you have plenty of room to experiment. The key though is to make sure you start the project fresh with whatever tempo you want.

Bob


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