T.Rex is well known for some good pedals but this time is a flop. I'm not a fan of Mark Tremonti but this phaser on paper can really be awesome but is not, The rate knob till twelve o'clock has amolst no difference and then it get to a wild wave that is almost impossible to handle. The cool feature is the grit knob that adds some drive to the wet signal. I'm really looking forward to buy a new one, this T.Rex has too much features with no quality. Last thing,sometimes it doesen't work unless you move the switch on the front panel.