A good place to start is the ACW - Automatic Chord Wizard - in Band in a Box.

This allows you to load an Audio file such as your already recorded performance, onto the single Audio Track in BB and also to tap keys to line up the First Bar and also to tap again to create a Tempo Map throughout that performance, which likely should be done in order to get the Autoaccompaniment parts added after Sending to Band in a Box and then selecting a fitting RealDrum and a RealTrack or two.


--Mac