Comment 2 for bug 1074783

I can see how I wasn't clear.

This issue isn't that sound is coming out of both devices; it is that once I select "Digital Output (S/PDIF) USB Device" (under the "Output" tab of the "Sound" preferences dialog), the sound continues to be played through my internal speakers AND no sound comes out of the ArtDio NB-005B USB Speakers (for which my selection specifies).

Again, this behavior started after upgrading to Ubuntu 12.10 beta 2, but worked correctly in 12.04.

When I run alsamixer, it says

│ Card: USB Device 0x46d:0x821 F1: Help │
│ Chip: USB Mixer F2: System information │
│ View: F3:[Playback] F4: Capture F5: All F6: Select sound card │
│ Item: Esc: Exit │
│ │
│ │
│ │
│ This sound device does not have any playback controls.

----------------------------------------------------------------
Actually, that's probably not the right device. It is this one, and it is not muted:

│ Card: USB Audio Device F1: Help │
│ Chip: USB Mixer F2: System information │
│ View: F3:[Playback] F4: Capture F5: All F6: Select sound card │
│ Item: PCM [dB gain: 24.00, 24.00] Esc: Exit │
│ │
│ ┌──┐ │
│ │ │ │
│ │ │ │
│ │ │ │
│ │ │ │
│ │▒▒│ │
│ │▒▒│ │
│ │▒▒│ │
│ │▒▒│ │
│ │▒▒│ │
│ │▒▒│ │
│ │▒▒│ │
│ ├──┤ │
│ │OO│ │
│ └──┘ │
│ 66<>66 │
│ < PCM >