I guess you could edit the vocals first with some nice software like soundforge for example.
Then it will be easier to combine with the beats using fruity

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"The world is not beautiful. And that, in a way, lends it a sort of beauty."

--=My Music=--

as long as the accapella is in tempo, all u have to do is just find the tempo of the acapella and then just add it in to your mix