I had my RM16AI working perfectly using the control room in Cubase Pro. Then I updated the firmware. Mistake. I had monitor mixes on Aux's 1/2, 3/4. These appear as Firewire 17/18; 19/20. They are working. I was running my speakers from Aux 5/6 - Firewire 21/22. Level is visible. But no sound from the speakers. What am I missing? Thanks very much.