I have a Steelseries V3 PC-Gamer headset which has a single 4-pin phone plug at the end (REar, LEar, Mic, Gnd). Can I build an adapter to plug this into the 8-pin Foster on the 6500? The diagram for the Foster shows Mic+ and Mic-. Can I ground Mic-? or do I need some sort of isolating capacitor from Mic- to ground?
Thanks for your help.