Ive assigned a drawbar sound to a lower sound. How to I have a rotary effect on it. When I press the jotstick forward the rotary sound works for the upper sound but not lower.

There is probably an option under Controllers to have the joystick recognize left hand. Default is right hand. Not in front of it right now.

are both upper and lower assigned to the SAME sound?

I tried to find out myself, and received no solution from the Korg forum. They didn't think you could assign the rotor effect to left hand. I am not saying that it can't be done, but many who own Pa4x don't know either. I finally hooked up my Ventilator, but the sub outs are a problem, so quit.

1 set of drawbars to upper 1 and 1 to lower

"I finally hooked up my Ventilator, but the sub outs are a problem, so quit."
What are the problem with the sub outs?

Aside from a dry signal, I forget except they were quirky, and not worth the hassle.

I worked it how heres how I did it

https://sites.google.com/view/korgarrangertutorials/lower-rotary-effect

I am certainly impressed. You ought to see if Korg needs another software engineer, unless of course, you are one already.

Not an engineer. But on further reading of the manual its only possible to have one set of drawbars. You can have drawbars on upper1 and lower but once you make changes to upper1 it will also make chamges to lower. But the rotary will work to both. It maybe possible to put one of the preset organ sounds on lower and still jave the rotary effect. Task for tomorrow.