How useful would you find vocal trance acapellas while mixing?

Some songs already offer acapellas, but they are very limited numbers of such tracks.

Personally, I think it totally depends on the type of vocals. If they are too integrated with the melody and beat (like most vocal trance) it wont be very useful. But if its simply speech over beats, then its easly transferable.

what do you guys think?

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-M2J

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