I've been using the Digitech Midi-Vocalist for about five years and for live performances, it's tough to beat. Someone said they were made by the same outfit that produced the vocal processors in the PSR 740 and PSR-2000, and this may be the case. However, the difference in the live sound quality is significant--even after the PSR processor is tuned. Personally, I'll stick with the Digitech Midi-Vocalist--it does everything I need and then some.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)