Eventide invented Multi-Voice Intelligent Pitch Shifting and the PitchFactor is a Harmonizer that gives you ten Pitch and Harmonizer algorithms from the Eventide collection. They include the original H910 and the Quadravox 4 voice harmonizer, plus Octave and PitchFlex effects. You can create arpeggios in the Harpeggiator plus synth effects for any instrument. There are also MicroPitch and Crystals sounds. The PitchFactor allows up to four voices of diatonic pitch shifting and up to 1.5 seconds of stereo delay, has studio quality sound, is compatible with guitar or bass and has a tuner built in. There is MIDI control via USB or MIDI in, out/thru.