Hey Moarfish,
As a technically literate OSX newbie:
It was a huge pain to get this build to get HDMI Audio working, but I finally got it going.
PLEASE: Update the recommended install guide. When I did install in the manner you suggested, it seems to interfere with the process toleda recommends.
My system:
Intel i5 3570K
Gigabyte GA-B75M-D3H rev 1.1
No dedicated graphics card
Here's how I did it:
1) Install OSX
1a) I didn't use MultiBeast whatsoever. When I did, it broke this guide, I believe on account of the No-DSDT Audio patches
2) Connecting storage devices to USB didn't work for a while after install. Eventually (after maybe 7 minutes) they started working
3) Install wifi or ethernet driver now if needed
4) Update to OSX 10.8.2 via the Combo Updater found on Apple's site
5) You'll need to install Java for DSDT Editor to work; It'll be an option to install when you start DSDT Editor if you have an active internet connection
6) Get a copy of the correct HDMI Audio patch for your CPU and Motherboard (Thank you toleda!)
6a) If you have the same motherboard and cpu as me, then
HD4000_AMI_EFI_hdmi_audio_dsdt_editing_kit.zip
6b) Otherwise, find the correct patch kit here:
http://www.tonymacx86.com/hdmi-audio/70765-mountain-lion-hdmi-audio.html
7) Extract the hdmi audio patch kit to wherever you feel like
8) Run DSDT Editor, go to File >> Extract DSDT. You should see a bunch of code load into the text frame.
9) In DSDT Editor, go to Patch >> Open. Open up the file ami_clean_compile.txt inside the location where you put your hdmi patch kit, hit Apply, then hit Close.
10) Do the same thing as Step 9, but instead using hdmi_audio_ami_efi_hd4000.txt, located in that same patch kit
10.5) Press Command + F to do a text search for precisely "layout". Case matters. There should be just one result, with i think this below it: "0x01, 0x00, 0x00, 0x00"
10.75) Change that series of 4 bytes to "0x03, 0x00, 0x00, 0x00"
11) In DSDT Editor, hit IASL >> Compile
12) In DSDT Editor, hit IASL >> Save AML as ..., and save a file called DSDT.aml to the folder /Extra
13) Restart the computer and HDMI Audio should be working. No audio volume controls except the ones on the TV itself, but it finally WORKS!
