I've now got an HTC Desire. I'm interested in connecting it to my existing car audio system, which is a Dension Gateway 500 that connects to the cars amp, etc. Currently I have an iPod Touch which connects via the bottom digital connector to a usb input on the Dension. There are loads of cables that connect the Micro USB connector on the desire to a USB connector - but I need an app or something to ensure that when I play a tune on the HTC the audio is output to the USB, not the mic or built in speaker. I don't want to use the HTC in Mass Storage mode (ie as a hard drive) because I want to use the touch screen player controls to choose the tracks, not the car audio controls. Is there such an App?