So I was trying to help my friend out with this issue the other day and I'm stuck. Here's the problem/setup: 1 mono audio track set to audio 1 1 stereo bus - left set to 1 out 1-2 - right set to 2 out 1-2 Problem is when the left channel output bus is engaged the ability to monitor the incoming signal dissapears completely. When the left output is disabled we are able to monitor the signal but only in the ride side. Play back occurs in stereo when both outputs are set. I'm a protools guy and I'm stuck on this problem. I'm thinking we're overlooking something simple.