the mic on that pioneer is most certainly separate. and the quality is brilliant..just the same as having any separate bluetooth unit fitted in like a parrot kit for example.
as for the earlier post...i believe that anything that is amped is not bypassed by the muting capability as it runs through a seperate output. however, it depends on the radio that u have. As i have fitted bluetooth parrot kits in sum cars with factory head units connected to on board amps and it only muted out the direct speakers but not those connected to amps. however, being an aftermarket radio...it may stil mute anything from the amps, i gues theres only one way to find out n try it i gues! also, being a built in bluetooth unit and not a separate unit, theres more chance of it being able to mute out the pre-outs sound output aswel. its only wen it comes to separate bluetooth kits where it may b different otherwise!
