I have a Mackie Onyx Blackjack audio interface, and my microphone is plugged into the first of two inputs ("left"). The other input doesn't have anything plugged into it. What this means is that whenever I record audio in QuickTime, it produces a stereo file with my voice on the left track and silence on the right track. However, Mac OS X sees the device as a 2-channel stereo device, and I can't seem to convince it otherwise.
Here is a screenshot from Audio MIDI Setup to show what I mean:
The only thing I can change is the "Format" from "44100.0 Hz" to "48000.0 Hz". Everything else is greyed out.
I investigated creating an aggregate device, but I see no way to eliminate audio channels from that either. How can I get Mac OS X to see this device as a mono input?