[Jack Ruston]

No.

The AVID hardware can not play back system sounds while PT is running.

BUT, the Omni allows you to route any of its inputs to the monitor outputs (provided you're using the omni as a monitor controller as designed). You use the mixer tab in the IO to control pan, level and mute of those inputs. So what you could do is to leave your mac set to play system sounds, and run a cable from the audio output of the mac to an input pair on the Omni. That way you would hear any mac system sounds, iTunes etc through the monitors all the time.

Caveat: I haven't tried this! I've only done it with a CD player and it worked perfectly, but I can't see why it would be any different, except perhaps some level mismatch from the mac built in audio output.

Would that do what you need?

J