I hope that you have things set up wrong. If not, I hope that it's just your keyboard. That can be fixed or exchanged. I would go into the vocalizer controls and adjust the vocalizer balance from there. I would explore a little bit.

I doubt Yamaha would produce thousands of keyboards with distorted vocalizers. And their quality being excellent, I doubt there is anything wrong with your keyboard.

I would like to hear if anyone who has this keyboard has tried the vocalizer.

Larry