It seems that I spoke too soon. I have found out how to fix it, and the fix could work for BOTH the input and output issues.
If I edit the file 'com.apple.audio.DeviceSettings.plist' (located at /Library/Preferences/Audio/), find my device by its MAC address, and then change:
(*** NOTE: My sampling settings and such may be off, but they still work. Your mileage may vary. ***)
<key>bits per channel</key> |
<integer>16</integer> |
<key>bytes per frame</key> |
<integer>2</integer> |
<key>bytes per packet</key> |
<integer>2</integer> |
<key>channels per frame</key> |
<integer>1</integer> |
<key>format flags</key> |
<integer>20</integer> |
<key>format id</key> |
<integer>1819304813</integer> |
<key>frames per packet</key> |
<integer>1</integer> |
<key>sample rate</key> |
<real>8000</real> |
to:
<key>bits per channel</key> |
<integer>24</integer> |
<key>bytes per frame</key> |
<integer>8</integer> |
<key>bytes per packet</key> |
<integer>8</integer> |
<key>channels per frame</key> |
<integer>2</integer> |
<key>format flags</key> |
<integer>4</integer> |
<key>format id</key> |
<integer>1819304813</integer> |
<key>frames per packet</key> |
<integer>1</integer> |
<key>sample rate</key> |
<real>44100</real> |
Then, launch Audio MIDI Setup and you'll see that you have your two channels back 🙂
No need to restart or anything!