Mountain lion audio trouble

hi
im on a 27"imac i7 chip 2011.
audio out is unreliable still after 10.8.1 update. Any app that makes a noise is affected. the audio is just not stable. crackles, little gaps or stutters.Ive compared some of the same audiofiles to double check n the iphone and they are smooth. Its making checking music mixes for any defects impossible as i cant trust the imac suddenly.
Its something i was hoping the update would fix but not so. As a music writer its unworkable. The previous Lion worked well on this machine.I cant see how something this fundamental slipped through plus I see many other similar mentions of this online. i dont have lion as it was shipped in the machine. Seems crazy to have to search out a previous operating sytem for something like this. Anyway its a complicated proceedure to reinstall it and I shouldnt have to.
Any ideas?

Ok,
If you have apple care and you can reproduce the issue off the bat, then I would make an appointment and go in and show them.
If you click on the little magnifying glass on the top right of your main screen (cmd+spacebar) and type in Audio Midi Setup, you might find that your settings are just too high for your digital out.
Turning these down to a lower Hz may yield you a more reliable signal.
The best signal will come from a cable that is made with glass.
Most tosling cables are made from a polymer which isn't as reliable with digital toslink.
Other then that, what it seems like your issue is, is an electrical thing.
You can install Lion onto an external hard drive and test to see if it still happens in that drive.
You can also make a new user, log into it, and then see if the issue still happens there. if it doesn't it means you may have had a faulty installation.
Another thing could be that you need to repair disks and permissions before reinstalling ML.
you can do this in the recovery partition right before you reinstall ML or in Disk utilty.

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At this point you probably think the errors are SyncPX's fault.
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