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#11
Th latest drivers for your laptop I can find are here ....
Sony eSupport - VGN-SZ320P - Software Updates & Drivers
These are vista drivers and I assume these are the ones you are using.
If you check on sound Playback devices and right click and show disabled options - hopefully they will show the What you hear or simlar
If the drivers do not have this functionality the only option I can suggest is to see if SoundMAX have any drivers directly for the actual chip