I'm wondering if there exists an analog envelope filter with a second footswitch to toggle between two different sensitivities? If it is not something known "off the shelf", have you seen a mod, custom job, or adaptation (like an external "favorites" switch) for this type of function? In a perfect world, I'd like it to be more Mutron III or DOD FX25 flavored rather than Moog; and I'd also like to have an input for an expression pedal to control the cutoff frequency. So yeah, I'm sure the Moogerfooger is going to be mentioned, but it's not exactly the flavor I'm after. Suggestions?