The driver is required for the system to establish a connection with an audio device connected via the HDMI port (connecting to the graphics card). The NVIDIA Virtual Audio Device is used if you want to connect your computer to an NVIDIA SHIELD module or another output component to speakers. Usually, it won’t be disguised by hackers as a legitimate module in malware to harm your computer. NVIDIA Virtual Sound Device (Wavelength Expandable) (WDM) is an official digitally signed component by NVIDIA and is a verified product of this company. Should I Uninstall Nvidia Virtual Device?.How to Reinstall/Update Nvidia Virtual Audio Device?.