It is a noise reduction at regalge more than simple threshold, and an on-off button that I do not know what it is seen that it makes no difference whether on or off, and of course a switch to crush with your biker boot, your cowboy boots or your first generation adidas superstar, anyway it will not change the characteristic of the beast.
And if you want the rack you can just solder two large steel bars and it fits in a 2U rack ... but hey I do not know if it's ultimately very useful ...

UTILIZATION

To set before the end of the chain delay and reverb (necessarily) ... pffff a manual ...

SOUND QUALITY

Use with bass and scratching ... necessarily ... I never tried it with the neighbor's dog ....

OVERALL OPINION

This is not madness, as the saying right now, it works fine as long as you do not have too bad a distortion, I use it to "calm" my big muff distortion and a boss, when I finish a solo to avoid the big "bzzzzzzgriiiiiiiifrrrrrrr" that generates the 2-bé small beasts ... but in fact I switch my disto after the solo ... um
And I find it handy for cons to Wipe unpleasant residual noise that can generate electromagnetic interference of certain aircraft and the background noise is amplified after passing all the effects loop (or no distortion) .
I also have a Boss NS-2, more modular and much more efficient with which I get a better result .... necessarily because I find it much more efficient ...