Knobs: speed, function, width
An activation button for the number of filters
There are in addition to the input and output and an output power ex program (I do not even know what it is, I only use it for input and output).

UTILIZATION

Bought used 'so I have no manual.
Usage is very simple, you have to know what kind of effect on research and here it is filled, it was really a lot of choice (although I do not really have a basis for comparison) through different methods (3 modes), the speed can be very slow or very fast, and the width also allows many possibilities. For my part, I put very little filters, because I think they distort the sound a lot.

SOUND QUALITY

The sound is simply amazing. It was more the choice of a great range of possibilities, nothing to complain about it.

OVERALL OPINION

It gave me when I bought my guitar (occas' also) to a vendor fair play. He already exhibited traces of wear. There is little, it was soaked in wine by accident (I say tempered if not drowned). I disassembled and cleaned with alcohol, and he continues to walk hell!
So in addition to having a very good sound I also say that it's solid.