I'm looking to get a setup where i have an envelope filter that i can control the sweep with an expression pedal. if you've seen the hot hands wobble ring thing, im essentially trying to get that but foot controlled. my first question is: does the envelope filter need to be a specific type with an expression pedal option? i currently own an old DOD Fx25 that i like a lot but im not sure if i can use it with an expression pedal. second question is: whats a good recommended expression pedal? im open to all suggestions, not too concerned if its pricey as long as its good quality. let me know guys, thanks!