You gotta be quick on the EQ’s my freind!
Normal mixers have 3 eq’s per channel (Yeah yeah A&H have 4 i know!) Sooo lets think about those 3 bands, low mid and hi
This is grossly generalising but :The Bass, beats, drums are controlled by the low
Synths and vocal are controlled by the mid
Cymbals etc by the high
So you have a tune playing and you want to bring in the new choon… to do so you cut frequencies with the eq’s so as the two choons don’t clash- if your first choon has a vocal, i’d possibly bring the new tune in by killing mid and setting hi at about 9 or 10 oclock.. you gradually swap out the bass lines this way, lift the line fader on the new tune and turn down the low eq on the old tune as you go… the old choon will run with the new bass line.
then fiddle with the hi’s till the new choon is taking the lions share of the sound… so now you got the new tune running with the vocals and synths off the old tune.. Now you can either line fade the old tune out, or turn the mid eq down while turning the new tunes mid eq up…. and you have a transition!
Or at least 1 way of doing a transition.. Swap methods, try to bring in the new tune by bringing in mids first, try sneaking up the line fader on the new tune with all the eq’s set at 12 oclock, there are a million ways, and only practice practice practice and experience will give you an idea of what the best way will be!
I hope that makes sense!