to import the acapella into ableton

set the tempo to the desired tempo of your remix

record it

export it

then reimport it into the remix workbook

i do this sometime when im sampling something

let ableton try to lock everything down at 103 bpms lets say.. then i export it and when i reimport it i can theoretically cut any bar and it will loop

make any sense?

ive done this with acapellas before with varying success

but again.. most times i put an acapella on a beat it doesnt match anyway