Good afternoon everyone, Since I posted this message I have determined that my sound card is a Realteck AC97 Audio. The What You Hear equivalent with this sound card is Stereo Mix which is active. My PC is an HP Pavillian Desktop we bought in 2004 and includes a condenser mic which I must mute some how in order to record from other sources. The problem now is less about What You Hear/Stereo Mix, and more about finding the control that mutes this microphone. Apparrently it functions independently of the Mic setting in Windows Volume Control. I muted the mic in Volume Control but the on-board condenser mic remains active despite this. If I unmute the mic in volume control it's welcome to feedback city. We found a mute button on the keyboard, but this is a global mute. All sound is muted if this button is pressed. All I need to do is mute the condenser mic which should then put me in business. If there are some HP gurus here who have this condenser mic on their system your help will be very much appreciated. Take care and have a great day. Peter Donahue