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[Q] Headphone Volume + Track Inputs?

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http://forum.xda-developers.com – Please forgive me if this has been answered before, my searches have not resulted in the answer I seek. I'm seeking to create a remote control for changing tracks while using my Galaxy S2 in the car, so that I don't have to pick up the phone and take my eyes off the road to skip songs. On my S2 and Note 10.1, the Samsung headphones have three controls: play/pause, volume up and volume down. There's no discrete button(s) for track control (NEXT / PREV) but I see that such controls do exist. This is what I've found for track control: wisebread.com/build-a-cable-to-control-your-a (HowTos)