ALC660 sound overgained

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I installed fresh OS X (10.5.4 retail, updated it to 10.5.6 via software update), installed all needed kexts and everything worked great. After only one day of use, sound suddenly became overgained (so much that I need to turn down volume to 1-5%, and it's still loud, but not distorted anymore, atleast) and only right channel works. Same is for headphones channel (sound is overgained/distorted and only right channel works).

 

I followed this procedure for installing audio kexts (from this thread):

- removed original AppleHDA.kext from /System/Library/Extensions/

- installed ALC660_660VD.mpkg (the one with Wiwi fix)

- repaired permissions

- rebooted

- sound works, headphones works, no mute (but who cares for that), input works

 

Why is this happening? Am I wrong somewhere? Is there any other driver to try out? Do I have to do something with original HDAEnabler.kext? What about kexts in /Extra/Extensions/ for PCIEFI v9? Do I have to copy anything there (AppleHDA.kext or HDAEnabler.kext)?

 

Btw, my specs are: Asus X51L, GL960 + ICH8, audio device ID: 0x10431783.

 

Thanks for reading this and (I hope so) for helping me.