Sending Left or Right channel of a stereo object to a mono bus seems impossible right now.
An example of such use would be sending only Left part of Main LR to a mono Matrix which then would be routed to left speakers at the concert venue. It is currently only possible if we configure Mains as two separate faders L and R.
6 years and no reply offering a solution?? same problem here. did you find a way to make it work?
Why not use a stereo matrix and then send left to the left speaker and right to the right speaker. 