I used to be able to simulate audio recording in the emulator by
passing in "-audio coreaudio".  Something has changed though (I've
undergone several SDK updates of course) and now my app doesn't get
any audio.  It initializes AudioRecord just fine but each call to
mAudioRecord.read() leaves the buffer full of 0s.  It returns the
buffer length so it acts like it put bytes in the buffer, but it put
0s as if it isn't getting any audio signal at all.

Any ideas what changed or how to fix it?

Thanks.

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