This is a pedal "boutique" made by Mojo Hand FX (formerly under the banner of ToneFactor).
It is an analog filter, the pedal is super quality, true bypass, Boss type 9V power supply, a switch and two knobs, just right for this type of effect.
The pedal is very simple aspect because there are only two knobs "level" and "range", but the two interact totally change the knobs and it changes again that the second is able to do. In short, we must hack to find his sound, depending on his guitar, microphone, amp, and the sound you want, but do not worry, you get there. For those who have had the chance to try DOD440 is exactly the same thing, you will not be disoriented, it's practically a clone (with better components).
When we managed to get the sound we're looking for, it's just huge. It sends, coupled with a kind Shredmaster distortion (but I use it with a Whiteface Rat), you'll sound of Jonny Greenwood during his solos live on Paranoid Android for example. But this pedal is capable of much more.
In short, a sound slap, very hot, very convincing, and do not drown coupled with other effects that do not drown the guitar in the mix.
Both effective funkys solo riffs that has character!
I've had a moment, she is top notch. I was looking DOD440 is the original better. It needs to be tamed, like any pedal of this type, but after a little use it gets to shoot some pretty amazing sounds of this pedal.
In short, excellent choice, a must have for any fan of Radiohead respectable