Hi Everyone,
Apologies if this has already been said, but have you tried:
Go into "Playback Devices" in windows audio settings
Select the Vive's audio device (usually there are two - the HDMI device and the USB device - this works for either)
Go into the device's properties, then navigate to the "Advanced" tab
Change the sample rate from 48000 to 44100 and hit "Apply"
Click the test button and it should sound normal