I'm experiencing an odd issue, and I'm not sure if it's related to WP8 or Lumia 920.

All of the phone sounds (music, video, phone rings, alarms, keypress feedback, the "thinking" sound when you do a voice search, games, etc) come through headphones, but not through the speakers. I have the volume up, and the "bell" set to ring+vibrate.

I don't think it's stuck thinking that headphones are plugged in - when I go to the audio settings section (audio, not ringtones+sounds), the equalizer page switches between the settings and telling me I need to use an audio cable when I plug and unplug the headphones.

The last time I can remember having sound through the speakers was a couple days ago when I was playing the game Chain Reaction, and I used the in-game option to turn sound off. I have since turned the sound back on in the game, but no dice. I'm wondering if turning the sound off somehow triggered some universal mute, and turning sound on didn't properly reverse the setting, but that seems unlikely.

Any other thoughts? Is the speaker just busted?