My DX-21 won't send the proper modulation signal to my Korg 05R/W. Trying to get the rotary speaker to flip from fast to slow like it would if you hit the joystick, aftertouch, trackball etc.

Anybody know of a product that would do this?
This is killing me for a long time.
Really don't want to buy another keyboard for that single added feature.

Thanks - Bert

Hey Bert, check for my reply to your e-mail. Sorry if I didn't get back to you fast enough. -Billy