It looks like Jibbler is an "enhancement" to the iPhone's SpringBoard app—the essentially invisible app that manages the homescreen and launches applications—and might be controlled by the headset. Unlike the shuffle, which lets your computer do all of the synthesizing work to talk to you, the iPhone would handle it in real time, apparently.
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I've been using 3.0 for a while, and every once in a while when I have the headphones in and the screen on when listening to music I sometimes hear a beeping tone and then the next song is played. Anyone know anything about this?