Windows desktop » Start menu » Settings » Control panel » Click on Hardware and Sound.
Click on Sound to go to the Audio Devices manager
Switch to the Recording tab, change the Sound Recording Default device to Avnex Virtual Audio Device for all devices.
Click OK to apply the new settings and close the Sound dialog box.
From now on, voice communication applications for online Games will use Avnex Audio Device as the main audio device to process audio, which then allows VCS to change your voice as you wish.