Have you tried using MultiBeast for Mavericks? I installed Yosemite on mine (4570R) and after using MultiBeast to load the audio drivers it works. I loaded the same ALC269 Driver.
I have the 4570R, and just finished an install of Yosemite. You need to follow the steps mentioned in the guides (linked to at the top of the page).
For getting it to boot the second time (when booting to the Yosemite installation) i had to set a boot flag (cpus=4)...but that was it. It took...
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