Flow control (FC) does indeed make a difference to the power on and change source for the MP-50. Without FC the MP-50 when Roon requests power on would:
- Not power on with Zone (recently powered off and still shutting down most likely).
- Fail to find/change source to Roon.
With FC the MP-50 power on control works correctly. First, power off MP-50 while on a HDMI input (not Roon). Second, within Roon, press play for the Zone while MP-50 is shutting down. Result is Roon gains control of the MP-50 and the zone is active.
As for main reason I created this ticket. I added my stuff to an existing request.