This is probably something stupid I'm doing.

My app makes a call to IMEDIA_SetVolume and awaits a response by callback. When that command reports success, the app calls IMEDIA_GetMediaParm for volume and awaits that response. When it returns though, the volume has not changed. In fact it appear impossible to change the volume on the simulator. It is always reported as 100 on the media notification for MM_CMD_GETMEDIAPARM.

The code works on phones.