DigiTech Vocalist Live 4 Harmony-Effects Processor 3- or 4-part vocal harmony with no programming or learning curve  just sing, play and let Vocalist Live 4s groundbreaking MusIQ technology do the rest Selectable voicing: unison, 3rd, 5th-above or below your lead vocal Pitch correction with four adjustable parameters Vocal enhancement effects matrix lets you adjust up to five parameters of Preamp, Compressor/Gate, EQ, Lead Effects, Harmony, Reverb, Echo Delay and Guitar effects XLR mic /line input with level adjustment, low-noise high-headroom preamp and 48V phantom power, " guitar input, " guitar pass-through and Guitar Ground Lift switch, " line input and 18" AUX input for CD or MP3 players, 18" headphone jack 3- or 4-part vocal harmony with no programming or learning curve- just sing, play and let Vocalist Live 4's groundbreaking MusIQ technology Selectable voicing: unison, 3rd, 5th-above or below your lead vocal Pitch correction with four adjustable parameters Vocal enhancement effects matrix lets you adjust up to five parameters of Preamp, Compressor/Gate, EQ, Lead Effects, Harmony, Reverb XLR mic /line input with level adjustment, low-noise high-headroom preamp and 48V phantom power, " guitar input 3- or 4-part vocal harmony with no programming or learning curve just sing, play and let Vocalist Live 4s groundbreaking