Does anyone know if the microphone button on the new JBL Roxy 250 Headphones (blue/green or orange/pink) does anything other that just pick up calls? I'm dying to know if you can skip tracks with the button 😕 I can't find any detailed description about this, nor did the people in the Apple store know. 🙁 Since my vibe duos don't work with the 3GS, I was thinking of buying them, but only if you can skip tracks.