Thanks for the detail there guys, (especially controlling both decks on one CDJ) that pretty much solves it.
I see why you thought I was on about DVS… When I was talking about audio routing via the SL3 I meant as in this diagram:
As you say, when I’m leaving I’ll just have to make sure to connect the audio cables from the CDJ to the mixer the same as I would if I was leaving the venue after using DVS.
Thanks again, fellas!