If you load the Drum track in RealBand then run the ACW on it and this will give you a tempo map then you can generate up a midi metronome track,
export this midi track to a DAW then drag all the Stems into the DAW
now render each Stem with embedded tempo (acid)
now if you import them into Biab they should fit the constant tempo.
EDIT: actually you can stay in RealBand, just drag all the other Stems in RealBand after you have run the ACW on the Drums then RealBand can add acid tempo info when exporting each Stem.

Last edited by musocity; 03/15/23 01:06 PM.