Only had a N7 for a day now but I am puzzled by the way the apps shut down. Like if I am using a streaming app like Pandora or TuneIn and I go to the running programs page and slide it out of view. I thought it was closing down that app, however it keeps on playing music. It even seems to keep on playing in sleep mode so are there many apps running in the background killing my battery? If I use the sound off mode is that just turning the sound all the way down but the app is still running?