Tony I wish Digitech or tchelicon would make a new harmonizer with the same layout like Vocalist Workstation EX.Easiest thing ever to use.Very fast to set harmony when you play live.I wouldn't mind getting even original workstation EX in a good shape.
mirza ... I totally agree ... and the presets that are written to be used without a midi connection and follow your voice while only indicating the key you are singing in work great ...
Here it is:
http://www.ebay.com/itm/DigiTech-Vocalist-Workstation-EX-Vocal-Harmony-Processor-/191394944113There are some power supply cords available on e-bay also ...
I had a problem with mine a while back and was able to find a pretty beat up one on-line that I bought for parts ... I sent it to the repair shop with mine and the techs were able to get mine working beautifully ...

These LOOK like they might work in the same way:
http://www.ebay.com/itm/Digitech-DOD-Voc...n-/111495661510http://www.ebay.com/itm/DigiTech-Vocalis...l-/251686609392