That situation is new to me, but I had a (somewhat related?) problem with the "harmony" feature. In harmony mode, after I stop a certain style, the RH sound persists, even if I don't touch the keys or the sustain pedal. I never found a way of getting everything back to normal without shuting down the keyboard.

Another problem I faced, is that sometimes, without any apparent reason, the vocalizer 'goes crazy', meaning it doesn't obey to the chords and melody I play. Here, I found a way to get back to a 'normal' vocal harmony. I quickly switch to pianist mode, and switch back to split mode. It works, but I would surely be happy to understand what and why is happening...

-- Jos�.