i mean with bluetooth c210 you can control music and siri different level volumI had c210 before I updated HU to AA, but prior to that I never had anyway of activating Siri other than holding down on screen home button.
c210 have 4 different way volume..
*music volume
*phone volume
*maps volume
*siri volume
c180 bluetoth only you can control siri and music volume same way if siri higt volume then music higt to.. But
c210 you can adjuste siri higt volume music low volume