Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter/Harmony Pedal | Musical Instruments and Accessories | Z String Music
TC-Helicon Harmony Singer 2 – Thomann United States
The 7 Best Vocal Harmonizer Pedals (2023) - Musician Wave
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