On my 3GS w/ iOS4, whenever I open iHeartRadio, I can hear it fine. Whenever I hit the home button, it closes, and I cannot hear it, just like before. How can I do other things on my phone and still listen to the radio? Is there a write up on how to multitask? From what I've seen, anything I close goes into the multitask bar at the bottom. When I click them again, it simply starts the app, i.e. the app is not running.