To restore , you need the specific driver package from Apple’s Boot Camp 5.1.5621 (or later for Windows 10 compatibility).
After some digging, I found a solution that significantly improved my audio quality: apple macbook pro a1278 audio driver windows 10 high quality
You need the last stable driver packages released for these legacy machines. To restore , you need the specific driver
The MacBook Pro A1278, also known as the 13-inch MacBook Pro, is a versatile and powerful laptop designed by Apple. Released in 2012, this model boasts an Intel Core i5 or i7 processor, 4GB to 8GB of RAM, and a range of storage options. Although it's a few years old, with the right software and drivers, it can still deliver an exceptional user experience. Released in 2012, this model boasts an Intel
: In the same menu, check Disable all enhancements to prevent Windows from clipping the audio at high volumes.
If your BIOS mode is Legacy but you still have no sound, you may need to force-point Windows to the correct driver. Device Manager (right-click the Start button). Look under Sound, video and game controllers