I have a MBP 15" 2010 with the faulty audio chip . The workaround is to open Audio MIDI setup and change the audio output format from 16bit to 20bit. However, every time I reboot the setting is reset to 16bit. Can I set a default, or is there a command that can be run through a boot up script?  At low volumes through headphones, the sound is distorted and fuzzy.