Audio adjustment only works sometimes

I've been trying to mute the volume on my audio clips with variable results. Basically if I make adjustments to the volume it generally doesn't work but occasionally, and intermittently, it will work. The audio graphs below the clips always change but the actual sound doesn't. I notice from a couple of other posts that the latest update 9.0.4 solves some of these problems but I have this version. Just wondering if anyone else has noticed this behaviour?
BTW I am using a MacBook Air with latest Lion installed.

Having the same issue with 9.0.4 installed and .  Audio adjustments to mute audio simply stopped working. 
Mac Pro 1st Gen
32 GB 667 MHz DDR2 FB-DIMM
NVIDIA GeForce 8800 GT 512 MB
Mac OS X Lion 10.7.2

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