The Electro Harmonix Pitch Fork is an incredibly diverse polyphonic pitch shifting pedal that has a 3 octave range. You can shift your guitar sound up, down or both at the same time with the Pitch Fork, whether you would like to control it continuously with an expression pedal or at set intervals using the 11 position 'Shift' switch.
3 Octaves of Pitch Shifting
You have a lot of control over this pedal and just how much shifting you want on your sound. Everything from a 17 cent detune that works great for adding a different feel to your sound, to 3 octaves above or below and a wide choice between. The Pitch Fork also features Dual mode where it selects a harmony for the interval you have chosen for example you could get a perfect 5th above and 1 octave below from a single pedal.
You don't just get set pitches with the Pitch Fork though. When you plug in a expression pedal in latch mode you can control the pitch continuously so you get exactly what you want every time. This particular trick can also be used to create whammy like effects that increase your pitch shift the further you push the expression pedal.
Latch and Momentary Control
You have two main modes of operation with the Pitch Fork, Latch and Momentary. When in latch mode you turn the effect on and off using the footswitch and you can control the pitch with an external expression pedal to go from no effect to what ever interval you have selected on the 'Shift' switch.
In Momentary control mode the effect is only on if you hold down the built in footswitch. When you release the footswitch it goes back to your standard non effected sound. While in the momentary mode you can control the Glissando rate from 4 milliseconds to 2 seconds with an external expression pedal.
Here's what Electro Harmonix say about the Pitch Fork:
The Pitch Fork transposes an instrument's pitch over a +/- three octave range and features three modes which allow the pitch to be transposed up, down or both, simultaneously. The pitch shift amount can be set to a fixed interval or continuously varied by an expression pedal or control voltage.
The controls are straightforward and intuitive. An 11-position Shift switch selects the maximum transposition interval ranging from D (Detune), a shift of 17 cents, through Minor 2nd, Major 2nd, Major 3rd, Perfect 4th, Perfect 5th, Major 6th, Minor 7th, 1 Octave, 2 Octaves and 3 Octaves. A three position toggle switch controls whether the pitch is transposed up, down or both. In Dual mode, two pitch-shifted signals are output. One follows the shift knob as if in the Up position while the other creates a harmony. Dual Mode settings include M3 up + P5 up, P5 up + 1 Oct down, 1 Oct up + 1 Oct down and many others. A Blend knob controls the mix of the dry signal and the effected signal, and an EXP jack enables the player to control pitch and glissando with an expression pedal.
The Latch button selects Latch or Momentary mode which affects how the footswitch and EXP input behave. In Latch mode, the footswitch toggles between effect on and buffered bypass each time it's pressed and the EXP input continuously varies pitch. In Momentary mode the effect is only on while the footswitch is depressed and when it is released the Pitch Fork goes into bypass.
In Latch mode the EXP input controls pitch shift amount, ranging from unity to the interval set by the Shift knob, and pitch varies continuously throughout the expression pedal's range. In Momentary mode the EXP input controls glissando rate for the Pitch Fork's footswitch. When the bypass footswitch is pressed, the Pitch Fork jumps from bypass to the interval set by the Shift knob. The amount of time it takes to reach that new note is the glissando rate. When the footswitch is released the pitch will return to unity at the same rate. That glissando time can vary between 4 milliseconds to two seconds depending on the heel/toe position of the expression pedal. The default glissando rate is 60 milliseconds when nothing is plugged into the EXP input.