Leeboy, a harmonizer is definitely a good add-on if you want to experiment with vocals. With all this talk about off-key singers, it's still a lot of fun to hear harmonies when you sing. I bet you're not as bad as you say. If you would like to hear what harmonizer vocals sound like, chek out "Lyin Eyes" "Crazy Love" or "The Weight" on the Demos page of my website. That is the Roland G70 harmonizer, but I now use a Digitech Vocalist VR.
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Cass