E1705 Core 2 Duo 2ghz, Leo4All v3.
STAC9200 in package did not work. Controls appear but no sound. AppleHDA 1.20 plus the STAC9200.txt over at that site with the dumps fixed it (mute only turns on, have to adjust volume to un-mute)
The 2-finger scrolling thing didn't work out so well. I did figure out on my own that it's pressure-sensitive, but only seems to work for me with one finger pressed kinda hard. It did mess up double-tap sensitivity ; ;
I had the issue that no audio source was selected after installing the package, may be the same with you (probably is if you saw the controls), go into system preferences then audio and change the audio control to the master one and it will work. Infact with this kext you control the subwoofer and mid-highs seperately, but you can adjust the buttons for this in butler.