When I was using the onboard harmonizer, I set up a registration that saved the foot pedal settings, which included vocal harmony. However, I quickly discovered that you had to also had to anchor the setting in place by utilizing the Parameter Lock or it would often change when I switched to another style. I'm not sure why this occurs, but the parameter lock kept it in place until I turned the keyboard off and had to fire it up again. So, upon startup, I first unchecked Mic Settings in the Parameter lock, then activated my registration, than went back to Parameter lock and anchored everything in place. It only took a few seconds, and it worked quite well.

Later, when I began using the TC Helicon Harmony-M, I did not have to worry with this, though the mic output still went through the keyboard, but I no longer used the Keyboard's onboard vocal harmony - just some of the effects.

Hope this helps,

Gary