I'm running on an Intel Mac iMac 2GHx with OSX 10.4.7. Audio in is from a Yamaha mixer board into a USB port. USB audio input is selected from the System audio control. Audio level is good from the light bars on the mixer board, and on the mac System audio control. So input is getting in. But when I record a movie (with Mic track checkbox on), then play it back, the audio is flat at zero---no sign of anything, including on the level bars in the QT playback window.
I have a secondary analog connection from the mixer board to the iMac audio line in; when I select that input, the audio comes in and plays back fine. But of course I'd rather use the USB input for better noise performance.
Is there something I need to do to get the USB input to work, or is this a bug/unsupported features? Thanks.
