yeps. so, played a bit and -
01) for Windows - under Sound Settings and when clicking the speaker icon in the tray, only option for the M24 is [ MODEL 24 (Model 24) ], no choice of outputs.
02a) launching Live, i have output options for all channels, but i would prefer to use 1 and 2. you were correct good HammarLUNNNNNNNNND, it was summing to mono on channel 1. which.... makes all the sense.
02b) i put both Channel 01 and Channel 02's Mode switch in PC, get sound in both. panned 01 hard left, 02 hard right. now when i'm in a track in Live and move the pan from left to right, speakers and headphones reflect that.
is that the best way to do that? seems to work.
thanks for all the help!