I know the dealer can turn it off, that was the first "mod" I had done to the car. Not sure about turning up the volume on it. This thread by @
Yruyur shows a lot of the changes that can me made (that's why I knew to ask for it to be turned off).
http://www.ft86club.com/forums/showthread.php?t=34502
Absolutely stupid that you have to have the dealer do this. My 2004 Suburban has all of these and more adjustable from the steering wheel controls.