If you're thinking of going the distortion -> filter route, how about the moog lowpass filter pedal? though im not sure about the price.. then there is also the Frostwave Resonator http://www.frostwave.com/theresonator/index.html Both of these you can plug a control pedal into, or add some extra things like LFO's to get some animation in the filter sound... Cheers, Alwyn