Boss Tera Echo filter sweep Question

[patrick398]

Hey, i recently picked up a boss tera echo from a second hand shop, didn't particularly want one but at 55 quid i couldn't really say no. Anyway turns out i really like it, it's got a really cool filter sweep on the delay trails which i love and i was wondering is there a pedal i could build that achieves this dramatic filter sweep but on the dry signal rather than the trails? I've been looking at a lot of envelope filters but i'm not sure thats quite what i'm after. I need something more over the top like a Mutronics Mutator but in pedal form haha

Cheers