It's hard to imagine a guitar pedal that is easier to use than the MXR Phase 90. It consists of a single rotary knob for "speed" that alters the intensity of the phasing effect, and that's it.

Now, over 40 years on, the range of Rockman units is apparently in demand, so MXR is catering to that with a new addition designed to revive the sonic character of the original headphone amp. The new ...