What do you use for a transmitter that will mute music while getting directions from MapQuest? I had an iPhone and a gogroove transmitter and I could listen to music then it would stop playing while directions were being said. On the galaxy while using the same transmitter and MapQuest, the music doesn't get muted when directions are being spoken. They both come across at the same time. I want to be able to listen to music then have it stop when the directions are being said. Being able to charge the phone at the same time is a bonus since the battery drains quick. Thank you!