Hey y'all! I was wondering if there is a notch filter in pedal form or if it would be difficult to make? I know I can't do it, but I have friends who can wield a soldering iron. See, I have a problem with our rehearsal space. It has standing waves at around 120Hz. Really head splitting stuff! Now I'm using my fDeck HPF to get rid of it, but as you can imagine I'm taking away a whole lot with it.