DigiTech Vocalist Live Pro VLP Vocal Harmony/Effects Rack Processor with 1 Year Free Extended Warranty 3 or 4 part vocal harmony using the musIQ technology with MIDI that analyzes the guitar and keyboard signal according to chord recognition. Selectable unison, 3rd, 5th or octave above or below of lead vocal. Pitch correction for each individual voice with 4 adjustable parameters Lead vocal and harmony effects; Compressor, Lexicon-Licensed Reverbs and EQ, Persona models Edit, store and recall 99 user or 99 factory presets