Sometimes when I have an Ipad connected to an interface for multi track out, the play button will seem to start the track and I will see the play bar moving but no sound will come out. I will have to stop the track, move to another song and go back to the original song and then it will work. This is not happening all the time but it is happening enough where it is a little bit of a problem. Not sure how to diagnose or fix this.
Phil