It presents five potentiomtres: it allows many possibilities of rglages.
Activation of the overdrive is done by pressing a tiny button flat.
Availing oneself of it's own power cord (mine is still taking amricaine with two flat ends!).
Usage is simple: it's a pedal ...
However, the small flat button makes it difficult to activate the effect. Personally, I have to tape over a piece of heavy cardboard to activate more easily.
This pedal is not meant to be a sound "crunchy" prfrer Blue Tube ( see picture ( http://www.effectsdatabase.com/images/gear/TubeWorks_BlueTube_l.jpg ) )
The sounds are really good when the overdrive is turned back: Sounds very specific on and at the same time very powerful. The qualiseur is very effective.
Personally, I put my Real Tube upstream of a multi-purpose.
I use this pedal since 1991! I did with her many concerts.
That's the kind of effect that we must maintain: beautiful sound, beautiful quality manufacturing and reliable pedal.