Hello. I'm sorry if this is in the wrong section. I'm using an iMac. I recently bought a Logitech headset but I can't seem to get the microphone working on Skype. The headset has 2 outputs; of course one is for the mic. I don't want to use the built-in mic of iMac, I have to use the one on the headset. But I can't get it working from neither the System Preferences>Sound nor on the preferences section of Skype. Can anybody help me about this please?