I found microphone muting source and tested 2 different sound drivers for 2 PC. I know the input ids different for mic. Muting works! it's OK. Kambiz says: You have to use DeviceID property of the component to select the proper device on one of the mixers. Unfortunately, there's no straight way to find DeviceID's of a mixer. However, using the similarity between name of the Mixer and name of the D