sounds like the mute button on the 05-09's. I don't recall cuz i've got a Pioneer. If so, then maybe the volume level gets programmed in the settings when it's presses. Sorry if this is wrong. Just throwing out ideas while at work.

 

Hi Antigua Mustang Man,

Thanks for sending me your information. I am looking into it and will respond once I have researched your particular 'stang.

pdonket,

Thanks! Much appreciated!

~Natasha