Hi,
After years of trying to find a solution to fix loud audio level bumps when playing/pausing video and music files I have finally found a fix! Go to device manager, flip the arrow open next to "Sound, Video and Game Controllers". You'll see:
1. High Definition Audio Device
2. Realtek High Definition Audio
Right click on #1 High Definition Audio Device and select "Disable". Don't uninstall it will just reinstall and the problem returns.
Leave it disabled, problem solved!
Regards,
Terry