Octaver Pitch Modulator Harmonizer and Signal Processors
Pitch modulator effects are so called because they modify the pitch of one or more musical notes by altering the signal frequency.
Some pedals in particular have been more successful than others and now represent the standard for this type of effects: the Boss OC3 (Super Octave), the Digitech Whammy and the POG Electro Harmonix in its various versions; all available from Your Music.
Among the most recent producers, Your Music points out the Rainbow Machine and the Data Corrupter by Earthquaker Devices.