The KN7000 harmonizer is not very useful, in the past I used a Digitech harmonizer with my KN1000 for singing and it worked very well, recently I got a "TC Helicon harmony singer" around $200 its designed to be used with a guitar but it works very well with the KN7000 for vocals, it creates harmonies that follow the chords played with the left hand. It has 8 different types you can choose from plus reverb effects.