I have a new 2013 Spark with touchscreen system. Something I've run into a few times already, and seems bound to frustrate me: how do I use the touchscreen without listening to the radio? I have almost no interest in radio (XM or otherwise), but do find the other features useful -- Bluetooth audio, hands-free calling, USB input. Yet, whenever I'm in the process of connecting one of these, the default for the system is to play whatever radio station it was last on. I just want silence.
Example scenario: I'm listening to some music over Bluetooth from my phone. I stop the car and get out (