yep word to merc, thats how i get down... then just play around with the stretches or find out the bpms using this: http://www.download.com/MixMeister-BPM-Analyzer/3000-2169-10290907.html
and then change the acapellas or instrumentals using this: http://www.kvr-vst.com/get/696.html
and...