just do the beat-matching with that part of the track that has beasts, then go back to the intro and drop it at the right moment ... most intros start on the first beat of bar 1 ... then make adjustments by listening to the overall rhytmic feel...if there's no explicit rhytmic element you'll have to work with the strings, pads etc (they're all rhytmic too) to marry the two tracks ... knowing your tracks helps. ... that's if you really want to mix the intro. personally i'd skip it.
armin shook my booty to big daddy rick (wade) last night ... hardcore / marble floor ... yeah!
