I got the sennheiser g4me one headset and this is my first gaming headset, so I am quite a noob when it comes to anything audio. It has the green 3.5mm cable for the speakers and a pink 3.5mm for the microphone. When I plug it in only using the green cable the microphone works as well so my question is what is the pink mic cable for if I don't need it plugged in for the mic to work?