Apple

but get constant PerformThru: error 1768846202 when calling -stop

also, -stop method has to be called twice to get ducking to work properly again.

Any ideas?

-(void) deActivate {
     if(self.unitIsRunning)
     {
          XThrowIfError(AudioOutputUnitStop(self.rioUnit), "couldn't stop unit");
          self.unitIsRunning = false;
     }
     AudioSessionSetActive(false);
}
- (void)start {
     UInt32 audioCategory = kAudioSessionCategory_PlayAndRecord;
     XThrowIfError(AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(audioCategory), &audioCategory), "couldn't set audio category");
     AudioSessionSetActive(true);
     self.mute = NO;  
}
- (void)stop {
     self.mute = YES;
     [self performSelectorOnMainThread:@selector(deActivate) withObject:nil waitUntilDone:YES];
     UInt32 audioCategory = kAudioSessionCategory_MediaPlayback;
     XThrowIfError(AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(audioCategory), &audioCategory), "couldn't set audio category");
}