The operation of the 2013 DOD Phasor 201 is pure simplicity. Like the original, the Speed knob controls the depth and speed of the phasing effect, with great tone at any range. True bypass allows your guitar tone to remain pristine even when the DOD Phasor 201 (2013) is off. This is a big difference from the original which would color your bypassed tone. The modern 9V DC power supply input make the pedal more pedalboard friendly.