Im using a Logitech head set with the mic attached and i cant get it to work im mostly trying to use it for ventrillo i have it attached to the back of my comp its not a usb it has the mic cable and the speaker cable both plugged in the right spot idk whats the problem i go into my volume controls/properties and im using Sigma tel Audio as mixer device when i try and look for mic there is none so i cant see if it is muted or not please help.