Voice lessons will always be a great idea, it should be first on your list. If you love to sing but have doubts about the quality of your voice or your voice is not fitted for the venue you are playing then the voice harmonizer is a great tool to add (to cover up)
No machine can improve a voice but it can add a bunch of weird sounding guys and girls to help you along.

My example: I have a Sinatra type of voice. Please don’t miss-read, I did not say a voice like Sinatra. Have you ever heard him sing any of the good 50’s music? In my case I got the job done by using a harmonizer for some 50’s 60’s and disco. I am even worst with country music. I don’t think anything can help that. (smile)

John C.