I'm in the same boat as Blitzkrieg. Since install I've had no "command" audio. My music just gets low and nothing. I had my NEX 500 installed at best buy and at the time I had a blown front door speaker. The best buy installer told me that that's the speaker all command audio including caller audio comes from. Finally got a new set of speakers in today and still no "command" audio. I have no idea what the problem might be.