XDJ R1 - Channel 1 = midi & Channel 2 = Phono2

Hello,

I just installed Rekordbox and I try to do it work this way :

I would like to send Rekordbox on my channel 1 (left) and send my technics MK2 sound in my second channel (right). The problem is that when I select USB on the right deck to use my phono2, it work for my MK2, but my channel 1 is disabled, when i select MIDI, indeed, the CH1's indicator light (orange one) is turned off.

Does someone have a solution, or is it just impossible to use my XDJ R1 like this ? 

Thanks,

Karm