How do I turn off system sounds in Audition?

Hi,

I have all the Windows system sounds turned off in Control Panel --> Sounds. But every time I click something in Audition, I get one of the sounds - piano chord hit, bell, click sound, etc. It's annoying to try to mix and have to wait for some of these sounds to fade out (the piano sound takes nearly 10 seconds to go away). This is only happening in Audition, no other programs on my computer.

Any help would be appreciated!!

Thanks!

-Ro