Amazon.com: Stax Guitar Harmonizer Pedal Digital Effect Pedal Harmony Pitch Shifter Detune For Electric Guitar Bass Mini Size True Bypass : Musical Instruments
Top 9 Pitch-Shifting & Harmonizer Pedals For Guitar & Bass – My New Microphone
Amazon.com: BOSS VE-2 Vocal Echo Pedal for Singing Guitarists | Real-Time Vocal Harmonies and Effects | Create Harmonies with Manual Key Selection | Connect Guitar for Auto Harmony Function | 24 Harmony
Guitar Pedal X - GPX Blog - Electro-Harmonix's Intelligent Harmony Machine delivers a Neater and Smarter Harmonizer with Classic Pitchfork style Pitch-Shifting onboard too
Boss PS-6 Harmonist Pitch Shifter Effects Pedal Electric Guitar Harmon – The Music Farm