you have to choose between the reverbs, the tremelo, and the pitch shift. you can only use one of those at a time.

and the fuzz/overdrive is either off or on with the pedal. i think you get a tone know to work with on that part of the pedal.
I love mine. There are plenty of reviews out there on this pedal. Have you watched all the youtube vids? They give a pretty detailed look at all the functions.