If you go to the area where songs are posted, you will find the vast majority are vocals, and just about everyone that posts songs uses the onboard vocal processor. Same is true at Keyboardplayer.UK where there are some very, very good singers, and all use the onboard processors - no complaints from them either. Probably the only person on this entire forum that uses his vocal harmony a lot would be Uncle Dave. All the others, including myself, use it very sparingly if at all. Deal-breaker - I don't think so.
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.)