Is it just me? I have a Galaxy s4 and when i use Bluetooth audio the volume control on the steering wheel doesn't do anything. the main tune dial works. I use google play music. I have been looking through the manual to see if there is a way to force the volume rocker to only mess with the master volume but no luck. My theory is it is sending the bluetooth command to bump the volume but only KitKat devices support that from what I have heard.