Hi. I'm using Sony Xperia ZL, Z1, ZU, Z2, Samsung Galaxy Note 2, LG G3. When I connected each 3-button headsets made by Samsung and LG, Only Z1, ZU, Z2 didn't fully worked with audio control with the circumstance: play/pause button works as volume up(ZL and other company's product worked well). When I connected 1-button(play/pause button) headset, only Z1, ZU, Z2 recognizes the button as volume up(ZL and other company's product still worked correctly. Only headset 'made by sony mobile(ex. MH750, MH410c)' works correctly for all devices. Why it would be?
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