I have a customer that is using the Advitel MOH server to broadcast real time news updates, events and weather forecasts (etc) to callers placed on hold. I have connected the headset jack on the server to the mic input on the Cisco USB MOH card and the quality is very poor. The "esses" hiss and there is a lot of crackling. I guess this is due to input/output being balanced/unbalanced. Has anyone successfully attached another make of USB card that has a line in port rather than a mic in.