Uninstalling an OSX update - Sound issue

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Joined
20 Nov 2004
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2,209
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Nock/Leicester
Guys

I have a major problem and need your help.

I have installed the latest osx update and now have a problem. I have my Imac connected to an amp which is connected to my ceiling speakers. Before the update i could set the amp to 7.1 and would get sound via all speakers. Could also set to Hall, Arena, 2.1 etc.

But now i can't change this at all, the AMP just says NOT AVAILABLE. I can't set it to 7.1 and am currently only getting sound via 2 speakers!!!

How do i uninstall this silly update?! I do not have time machine set up sadly.
 
How do i check the Audio Midi Setup?

Every time i do an update the output gets screwed!
 
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