Audio Quality very poor

1) Audio will go out of sync within a few seconds - pausing corrects the problem, but it will reoccur
2) Absolutely horrible sound distortion - screeching. Changing setting in Audio Midi.app will sometimes correct the problem, but it's completly random and inconsistent.
I have the same issues when playing back content in iTunes or via Quicktime player. The same issues occur on both Minimac & MBP, both SLepoard machines which are very well spec'd and no other unnessecary programs are running. The content works fine on OS devices.
I've trashed all .plist files related to audio and iTunes - but to no avail.
It's completely random - sometimes it's OK, sometimes it's not. Same content works fine & sometimes it's not.
Really irritating and time consuming and ruining viewing quality.

Hi all
How about trying this on W530? I am not sure how well would those settings work on W530.
http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/ThinkPad-W520-microphone-troubleshooting/ta-p/...
Have a nice day!
Peter
W520 (4284-A99)
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Dolby Home Theater v4 ; IdeaPad Slate Tablet

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As I get it it depends on what You feed iDVD and how in a way.
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