The MacBook Pro A1278 is a classic laptop model.Apple made this laptop between 2008 and 2012.It uses audio chips made by Cirrus Logic or Realtek.Windows 10 installs a generic audio driver by default.This generic driver causes a few common problems: No sound from speakers No sound from headphones A red light shines inside the headphone jack A red "X" appears over the sound icon Step 1: Use Apple Boot Camp Support Software
If the audio crackles after installation, it is likely a sampling rate issue. Apple Macbook Pro A1278 Audio Driver Windows 10