Notch Filter

Try using the Very Narrow setting, a mid range value, and a high value of attenuation - you will see what it's doing then. Except that you won't really, because the FFT anaysis resolution is nowhere near fine enough to show you the true notch you are creating. If you want a better idea, view it in spectral view, but make sure you use a frequency that's high enough to resolve - like at least 500Hz.

Believe me - with the figures I'm using I would certainly hear it working - if it was.

To be host, I'm beginning to suspect my install is not AOK, as I keep finding little things which I would have thought the beta guys would have found.  

Ah well... it's 4:30 am here and tomorrow is another day .