¿Alguien ha probado esto?
https://itunes.apple.com/es/app/improvox/id382109101?mt=8
ImproVox
ImproVox is a new vocal instrument. Real-time pitch correction and harmonization enable you to create lush harmonies as you sing - and always sound in tune! Add vibrant textures with effects like reverb, echo, and flanger, record your performance and share it with friends.
Features Include:
-Real-time vocal pitch correction
-Real-time 4-part harmonization in varying styles (Choral, Pop, Barbershop, Jazz, Baroque)
-Customizable key and scale selection (with a voice-controlled key selector)
-Traditional effects - reverb, echo, stutter, and cavern
-Abstract effects - ring modulator, bit crusher, flanger, and auto-wah
-Change and mix any harmony style and effect while you sing
-Shake the device to set echo times
-Recording capabilities with .m4a and .wav file-saving
-Overdub function allows you to layer your recordings with multiple performances
Por 3,59€ no espero que sea como una Helicon pero no pinta mal.