Got it working!The issue seems to be the AIR version: when compiling using AIR 3 everything worked as expected. AIR 2.7 doesn't. So something must have been fixed in AIR3....

Oh yes. Everything works as expected in the simulator. If it's relevant: I had an event listener on the audio publisher that was never called:, i.e.never called 'setMicParameters' in iOSThe microphone can be detected using   and works in other Flex apps. So, it's probably not the microphone itself.....

When using these components in an iOS app, I found that the audio publisher never started. Works fine on the desktop though... but it's doing my head in that it won't work on an iPad!