Run the file through the ACW (Automatic Chord Wizard), which will give you a tempo map on a bar-by-bar basis, as well as the chord progression (which you may have to tweak). As long as the original audio wasn't too "all over the place", you should be able to successfully add your RealTrack. I've done this a bunch of tones successfully. RealBand is probably better than BIAB for this, since it can deal with fractional tempo values, whereas BIAB can only handle whole number values.


John

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