I don't understand how I can't hear this app via my '98 villager's speakers. Yes, its an old car..I use a cassette adapter in the cassette player to plug in my phone or mp3 player. everything gets routed through the speakers that way...except for this app. I don't understand. Once the adapter is plugged into the headphone jack, it should automatically come over the speakers. (or so common sense tells me!) Checking the route through speakers option under sounds, does nothing. I only know when the app is talking when the music I'm playing on my phone goes mute. Then there's silence in the car. The music comes up again when the app isn't talking (even though I hear nothing), and this does not bother me in the least. Any ideas about how to hear navigation?