There are certain random issues with audio in Chrome/Flash since 10.8.4- one solution I've found is to use the older patched AppleHDAs from MultiBeast 5.4.3. The AppleHDA version is 2.3.7. Current AppleHDA is 2.6.0.
Here's a list of versions of AppleHDA since 10.7:
Hope this helps.
Older MultiBeast revisions can be found in the...
I have confirmed HD 4400 working on haswell BRIX with i5-4200U running Clover- to test using Chimera, use this command at boot: