Here’s an informative guide to getting the audio driver working for a MacBook Pro A1278 (Mid 2012 or earlier, depending on the specific model) running Windows 10 via Boot Camp.
Best for: Most users. This uses the Windows 8 driver, which is the most stable for Windows 10 on this hardware. Apple Macbook Pro A1278 Audio Driver Windows 10
For Mid-2012 Models: Download Boot Camp Support Software 5.1.5621 or 5.1.5640 from the official Apple support website. Here’s an informative guide to getting the audio
Background
Avoid UEFI Installation: If you installed Windows 10 via "EFI Boot" (the orange icon during setup), the audio hardware is often hidden from Windows. For audio to work properly on this older hardware, Windows should ideally be installed in Legacy/BIOS mode via Boot Camp Assistant. Manual Cirrus Logic Driver Update: Review: Apple MacBook Pro A1278 — Audio Drivers
What is Apple Macbook Pro A1278?
This specific sequence solves 99% of audio issues on the A1278 running Windows 10.