I figured out how to get sound working on my MacPro5,1 (mid 2010). Here's that thread. Basically:
sudo vi /etc/sysctl.conf
dev.hdaa.0.gpio_config="0=set 1=set"
hw.snd.default_unit=3
Part of this makes sense (which unit is the default), and part of it is magic(0=set 1=set). I gather this is...
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