Once you add KDFX, there is a new level of output routing added. When you assign a sound to output A, B, C, or D, in the program editor, or on the MIDI channels page, it DOES NOT mean that the signal goes to those physical outputs.

Instead it means that it the sound is sent to the A, B, C, or D inputs to the KDFX. At that point, the signal is routed to the FX1, 2, 3, or 4 FX Buses, and from there to the physical output jacks.

You choose which physical output the signal will be sent to on the Output page of the Studio editor (for the current studio). If you are using one of the preset Studio, ALL of our Studios have all four FX buses sent to the A Outputs. If you wanted to use all four of the stereo pairs, you might try starting by editing the Output page in the Studio editor in the following manner:

Out A: FXBus1
Out B: FXBus2
Out C: FXBus3
Out D: FXBus4