Hackintosh to Genuine Mac - How to undo Multibeast?

I'm trying to migrate from a Hackintosh to a genuine Mac Pro 3,1. In a perfect world it should be as easy as moving the boot drive from the hackintosh into the Mac. In all appearances it does, except audio does not work and I get the lovely "No output devices found" in System Preferences->Sound.

I've tried reverting to a vanilla AppleHDA.kext from a normal 10.9.5 install, but that didn't help.

Basically, I need to know what changes Multibeast does to 10.9.5 so that I can undo them and get the Mac Pro's built-in audio to function. Re-installing OSX from scratch is not a good option.

Why not simply install a proper OS X install on the Mac and use Migration Assistant to move all your data over.

Trying to undo all of the Hack stuff is hard work.

Rob