Bib

Is it possible/difficult to adjust the valves to eliminate the tick? I have the phone in my car, but don't know how to activate/use the mic or hear the conversation over the car speakers? Is it broken? There wasn't any literature on how to use th phone in the manual I recieved with the car. Finally, if i can find a nakamitchi head unit to replace my standard head unit, will the sound quality improve? If so, where can I find one of these units?
Thanks.