When the ipod is plugged into 910, using the ipod accessory cable into the dedicated ipod socket, Sound only plays over the 910s internal speaker. ALL sound. Including mp3s on the tomtom. I have changed the speaker preferences to line out, which runs to my car stereo. Everything continues to play through internal tom-tom speaker. When I disconnect the ipod cable, the mp3s on the tom-tom starts to play over the stereo. Have an fm transmittter dock which has all the same connectors hooked it up, line out to stereo, plays mp3 fine, hook up ipod same result as above EVERYTHING plays through tom-tom internal speaker. Thanks for answering.