When the hamony is set to the RH, it only defaults to VOCODER mode, meaning that you need to PUSH A KEY to get THAT harmony. If you release the key, the harmony stops. Try playing a slow 50 ballad like "Earth Angel" with triplet 8ths in the right hand and see what the vocal does. It'll make you nuts!

Since I play my own bass lines a lot, I need to be able to trigger a CHORDAL mode for the harmonies, so they just respond to the chord and not the individual notes.

I'm doing without that important trademark in my sound right now, but I miss it.