Update,
After a solid hour of testing and investigation today I have narrowed down the cause of this. When I plug my DDJ-Sp1 in on its own rekordbox dj Performance mode (Focusing on FX Panel 2 indicator at top of screen) works fine and as it should. When I then introduce my DJM 900 Nexus 2 mixer into the setup I.e plug the USB in and switch it on as soon as the computer A MIDI light goes on on my mixer (to confirm a connection to my laptop) The FX Panel 2 indicator panel within rekordbox greys out and this essentially. Restricts me to one FX bank for both decks.
Is this by design or is it a bug with the software/Midi ?
would love a response from somebody who may have an idea/speculation
Regards
Chris (UK)