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Amazon.com: TC Helicon HARMONY SINGER 2 Battery-Powered Vocal Effects Stompbox with Guitar-Controlled Harmony, Reverb and Tone : Musical Instruments
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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
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