maybe another way of saying all this, but in simpler form. cue the track you'll be mixing it right at the onset of a kick drum. since it's the kick drum that usually = 'the beat' that what you use to match beats. for starters try to use songs that start/end with just the kick drum. have the program (aka the track that's playing) in your monitor in your right ear, and put the cued song in your headphone in your left ear. now listen for the beats to synch, it'll sound weird, almost make you smile, when you find that the two songs are finally in synch. just let the program play, and keep restarting the cued song till the beats are as perfectly overlapping as you can get them. then slow down or speed up the cue'd track as necessary. also, when you're ready to mix in the cue'd track, start bringing up that channel with about a minute left on the track that's playing. that way the songs will start/end seamlessly to the crowd. this way, the songs are actually 'mixed'. and it wasn't like track A stopped and track B started. when you're really good, be it on vinyle or cd, the crowd shouldn't know that a new song is coming. once they notice the new song, you might be as far as 2 minutes into it. and why rip on cd dj's??? dj = disc jockey why didn't they name it tj for track jockey, or vj for vinyl jockey? i think track jockey would make it universal.