Larry, I would think you would want "ALL" parts to be heard through the 'headphones' to 'monitor' your Mix. It is also coming out the assigned output[s] too, right?? Why would you not want it coming out of the 'headphones' also so you could monitor the 'whole' mix with the headphones if necessary? If it's not coming out of the 'assigned' output[s] AT ALL, then you need to change the LINE OUT tab settings in the MIXING CONSOLE to route the sound, ie. R1, R3, etc., to the Sub1, Sub2, or Sub1&2.

If you have a Volume Pedal and want to route the R2 to a Volume Controller you would press the 'Direct Access' button then press the Volume Pedal. At the top of the page under #3 "Volume" - simply enable [ON] R2 Voice to the Volume Pedal and turn [OFF} all the other options, ie., Song, Mic, M. Pad, R1 Voice, etc. so 'only' R2 Voice is [ON]. That should do it. PS: Press the 'Exit' button at the bottom right of the LCD to exit to the main screen after you've set up your preferences accordingly. Although I have not tried this personally myself it should work. If anybody has a spot on answer that is different than the one I gave please chime in.

Best regards,
Mike