Okay, so my search for a great envelope filter continues. I have tried MXR, Carl Martin, EBS, Source Audio and a few more. I purchased the Fwonk on a impulse from a review done on pedals and effects.com. It's a great pedal. It will blow your speakers if your not careful. It gets as low as you can get. Fwonk needs high input to open the filter. My friend tried it with his vintage strat and it didn't even move it. But as of late I have been thinking about the Aguilar filter twin again. When I rented it from pedal Genie I was impressed. It had so much character, a lot to work with. I was still in my early phase of filter exploration so I didn't give it another thought. After playing with my Fwonk for a few months I figured I'd give the Twin another try, so I bought it on reverb. Mr. Blacks Fwonk BETA is crazy strong but hard to control IMO. If any of you gear heads can comment on either pedal in question please do. I would like to hear your thoughts on them! Thanks!