AudioServicesPlaySystemSound won't play if using AudioQueueStart to record audio

Question

I have an audio recorder app that I want to work similarly to the video recorder on the 3GS. When you start recording a video, it makes a small beep. When you pause the recording, it has a double beep.

I'm playing the beep and double-beep using AudioServicesPlaySystemSound() and that works fine in and of itself. However, if I start my audio recording using AudioQueueStart(), then the AudioServicesPlaySystemSound() doesn't play anything. I'm guessing the AudioQueueStart() is grabbing control of the speakers, although it seems like it would only need the microphone input and not touch the speaker output.

I put my call to AudioServicesPlaySystemSound() before the call to AudioQueueStart() but that doesn't help. If I comment out the AudioQueueStart(), then the sound plays fine.

Is there a conflict using both functions?

For the AudioQueue services, I'm setting

• kAudioSessionProperty_AudioCategory to kAudioSessionCategory_PlayAndRecord
• kAudioSessionProperty_OverrideAudioRoute to kAudioSessionOverrideAudioRoute_Speaker