Apple LED 24" Cinema Display audio problem under 10.6.8 (with post fix)

Hi all,
I'm using an Apple LED 24" Cinema Display with a 2010 MBP 15" and had been using 10.6.8 without problem. After installing the post-fix I now get static noice on (clipping?) when music contains lots of base. If I switch the output to my MBP's built-in speakers then the audio is fine.
Is there any way to un-install the 10.6.8 post-fix?

Solved the issue. This issue coming up after installing the 10.6.8 supplemental update was just a considence. I ended up tracing the issue back to my Atlona AT-MDP21 Mini-DisplayPort KVM switch and after fiddling with cables the issue went away.

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