[linux-audio-user] Problems with notch filtering

I need to be able to pipe stereo audio through a notch filter so that I can adjust it while listening and analyzing the effects it is having. Unfortunately I cannot find a way to do this. Here's why: - The only LADSPA notch filter I can find is "Mag's notch filter" (notch_iir_1894.so) -Jack Rack works great with this plugin, except when I change the number of stages in the interface, the change is only applied to one channel. (the other controls are applied to both channels) -AlsaModularSynth immediately segfaults when trying to load this particular plugin -Ardour will not work with this either. The controls don't do what they are supposed and al I can accomplish with it is some sort of wacky low pass filter. (how this is accomplished with a notch filter plugin is beyond me...) So... What else is there? these are the only programs I know of that I can pipe audio through very easily. (please don't suggest Pd, I've never gotten it to compile correctly) Anybody else have similar problems with this plugin? -Reuben