I use a USB audio interface so haven't really used the audio drivers or tried to keep them working. Now I'm trying to find the fix for Sierra, I just upgraded and can't seem to get my USB ports back. Changed things a bit more. Tried the MultiBeast 7/8/9 USB Series Support install and it didn't help. Back to fiddling with kexts. BTW, to run the Sierra installer in place I had to switch from the "OSXAptioFixDrv" to "OsxAptioFix2drv," it wouldn't start otherwise.