Ok, I need a new envelope filter. I've owned the Aguilar Filter Twin, Pigtronix BEP Bass Envelope Phaser and I now have the MXR M82. Out of the three, The Filter Twin is probably my favorite. Why? Well, I find that just about everything that I dial in with it I can use. It's a "safe" option. I do like aspects of the other two. What I am looking at now are the Keeley Neutrino, Mu-Fx Micro-Tron III and Iron Ether Xerograph. Unfortunately, I will not have the luxury of trying before making a purchase and I would love hear any thoughts about how the three new targets would compare to the three that I have experience with. Thanks!