Problem accessing Android MIC

I have been reading the microphone class, and I cannot figure out why this code is not tracing anything out:

var mic:Microphone = Microphone.getMicrophone();

mic.gain = 100;

mic.rate = 44;

mic.setSilenceLevel(0, 6000);

mic.addEventListener(SampleDataEvent.SAMPLE_DATA, micSampleDataHandler);

private function micSampleDataHandler(event:SampleDataEvent):void{

     log("Recording");

}

according to the adobe help files this is alls that is needed to actually speak into the mic and have it know you are doing so.  But I cannot get the micSampleDataHandler to fire at all when whispering, talking, or screaming into the phone.

Am I missing something?