Mirza,
In the next 2 months tc helicon is coming out with 2 new versions of harmonizers....the Quintet and Voice One nd I think they are both less than the prism. http://www.tc-helicon.tc/

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jam on,
Terry
http://imjazzed.homestead.com/Index.html
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jam on,
Terry
http://www.artisans-world.com/