
Hey Juus Sound, The DJS, unlike the sp-16, doesn't have individual or assignable outs, so when paired with the RMX-1000 (or any external FX box), the entire Master Out signal would be effected (or bypassed).
Internally, you can assign each pad to a different FX1, and you can choose which pad(s) are not effected by the Performance FX, but sadly there's no way to do a send/return effect on just specific pads.
It's too bad the RMX-1000 wasn't designed to interface with the DJS as a secondary Performance FX via USB.