It is a boutique overdrive pedal (wired by hand).
Four knobs: one volume, one tone, adjustable bass and gain adjustment.
There is a three position switch between these four knobs that changes the overdrive.
Very simple, no need for manual.
This pedal is just great. It is really versatile and can provide a very slight overdrive to Little Wing, or a more saturated overdrive.
But the way I prefer is definitely the overdrive light, sound breathes on every frequency, acute, severe and medium is really impressive.
In addition, the pedal is extremely dynamic and sound saturates more when you attack stronger. It's really breathtaking, this pedal is great, I had already seen some interesting videos on the net, and frankly I do not regret I have in my pedalboard many overdrives (Butler Tube driver, Xotic BB , Zendrive of Hermida, Radial Tonebone Classic) and frankly Wampler is my favorite (with BB).
It's a pedal that any good bluesman because she must have essential.
Outstanding, simply perfect. More for $ 199 new, it's really honest, the pedal is great. The best overdrive