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
Electro Harmonix Voicebox Harmony Machine and Decoder
TC-Helicon Harmony Singer 2 Vocal Harmony and Reverb Pedal for sale online | eBay
FLAMMA FV04 Harmony Vocal Processor Effects Pedal with 11 Different Harmony Modes - Walmart.com
TC-Helicon Harmony Singer Vocal Effects Pedal - Nearly New at Gear4music