Hi Larry
I consider myself something of an authority on Harmonizers (listen to Don and Donny's comments on my recordings) LOL
I'n the past I used the harmonizer on the Pa2x which worked well but sometimes was a bit robotic OK in a mix.
At the moment I own a Korg iH, a Digitech Workstation EX, a TC Helicon Quintet (The Workstation's little brother) and I,m awaiting the delivery of a TC helicon Workstation.
The Korg iH is based on the Digitech VH but has no effects great if you are using a mixer with FX.
The Digitech is good VH easy to use very natural harmony voices the on problem when using live the bypass button does not cut out the effects when addressing the audience.
The Quintet once again is a very good VH good mic preamp good harmony's and the bypass button cuts off the harmony and the effects great for live use.
The Digitech and the Quintet both have a good selection of effects.
The example below is the Quintet and the Pa600 first attempt.
https://www.box.com/s/ixogfioge747x5avyThese were recorded with the KMA and the digitech
https://www.box.com/s/2gzl37oyfz43kgqhqokshttps://www.box.com/s/stdpbtgkj9ui1p91dij2As you can see from the Photo's I like to have the VH at the front of the keyboard for easy access.
Some useful reviews:
http://www.soundonsound.com/sos/1997_articles/mar97/digivocalist.htmlhttp://www.soundonsound.com/sos/jun03/articles/tcheliconvoiceworks.asphttp://www.soundonsound.com/sos/feb12/articles/voice-live-play.htmIf you play at home the digitech is fine but for live use I prefer the Quintet
The woiceworks operates in a similar fashion to the Quintet but has more features ie dedicated lead voice doubling, pitch correction and extra effects also it has songbook ideal for live use.
I bought all my harmonizers on eBay so if I don't like them I can dispose without losing to much money. If the Voiceworks performs the way i expect I will be having a sale.
Hope this helps
Regards
Col