For years now I have wanted an effects pedal that would cut all frequencies above a certain point, ideally the cutoff would be controlled by an effects pedal. Assuming I understand what I'm asking for, this is basically a low pass filter. Every commercially available low pass filter, in pedal format at least, seems to be designed for an always on sound, and to be transparent and subtle, which is the exact opposite of what I'm looking for. Does anyone make a low pass filter that cuts all or nearly all highs, and can be set to a frequency that is blatantly obvious? I would add an expression control myself if such a thing exists. Preferably all this would cost like $50, but I'd be interested in finding out any option at any price point. related: what I want seems pretty commonly available in modular synth gear. Does anyone know anything about interfacing that to a pedalboard?