>Re-phrasing my question:
>
>Does anyone know how to Mute the Microphone in the Windows Volume Control?

What you need is "mixer" API.
- mixerGetLineInfo
- mixerGetLineControls
- mixerGetControlDetails, mixerSetControlDetails ( get/set the value/flags for the component )


Here is an almost complete example of VolumeControl in VB:
http://www.mentalis.org/vbexamples/vbexample.php?vbexample=VOLUME&category=SOURCE

HTH