i've had the same issue with my hackintosh (GA-Z87X-D3H) upon updating form 10.9.1 to 10.9.2: after waking from sleep, the audio would be gone. visually the outputs (such as in the control panel) were still there, volume control was still showing up, but effectively dead silence was all i got. sometimes the audio would still work after waking up the system, but only to fail after 30ish seconds.
upon reading in another forum about rolling back to a 10.8.5 kext, that's exactly what i did and with regards to audio all seems to be working perfectly fine and the way it did before the 10.9.2 update. (wahoo!)
as stated by toleda below, you can get the correlated kext (AppleHDA.kext and HDAEnabler1.kext) by running MultiBeast 5.5.5.
i dont know about the kext used in MultiBeast 6.1.0 (on 10.9 and 10.9.1 they were perfectly fine for me), but since I'm not noticing any difference at all using these older ones, I will just stick to them for the time being.
perhaps this helps someone who is experiencing the same issue but cannot get it solved with the kext in MultiBeast 6.1.0.