Digitech VHM5 Vocalist For Sale. Harmonizer Vocoder Pitch Corrector Vocal Effects. Play your harmonies from a MIDI keyboard. Great for that Cher Imogen Heap Madonna Pet Shop Boys pitch quantized vocal effect. Made by IVL / Digitech, this is an invaluable tool for the singing musician. The VHM-5 will take your voice and correct its pitch automatically, or give you up to 4 part harmony. It even lets you play the notes on a MIDI keyboard. This is great for autocorrection or vocoder like effects. This is the perfect gift for the vocally challenged, but please be advised that while it corrects pitch pretty well, it won't work miracles. It can also be used with instruments.