Hi there, I had done the first guide to install mavericks, I used 10.9.4 for quite some time until I decided to update to 10.9.5 and the audio stopped working.
So I followed this guide to try Yosemite and check it out before going back to 10.9.4 .
I got it working and even decided to try El Capitan, I have 3 partitions with the install of each one, so I didn't use a usb to install the os.
But the audio was still the same, not being detected. I got tired of trying and when I connected a tv/monitor monitor to it I started to hear sounds coming from the monitor, it seems it recognizes the audio but it doesn't recognize the speaker and neither the microphone. I can live without the notebook speaker, it was terrible anyway.
Mine is a brazilian model VPCSE 15FB, I will leave this message here in case someone is also having problems with the audio.