I am in big trouble !!! I sold my DDJ 800 and got the RANE 4 I thought I can map it easy which I have done for most of it the only big issue is the sound not coming out of both decks 1&2 both decks coming out of channel 1 so for example if I am playing out of deck 2 and use the EQ for deck 1 it is affecting the sound coming out of deck 2 even though I mapped deck 1 EQ for deck 1
I figured it out after few days of trying
So basically avoid channels 1&2 or 3&4 under devices in the mixer mode I actually used ch 9&10 also for pre Cueing I just used the laptops jack out and it worked !!! Then you can assign all the buttons and nobs for each one