Good evening Brian,
Initially I was panning purely in reaper, and tried speakers in both Alt outs and main outs. left channel in reaper would sound both left and right. I have subsequently, taken channels 31/32 USB and used the Pan knob, 31 is hard panned left and 32 panned right. Music from internet speaker tests and tracks on reaper on left centre and right appear to play ball now.
I am hoping this is the correct way to do it on this desk. I can send some images tomorrow is this is not making sense.
Best regards
James