Do what the other guys said, but it doesn't work in ALL the fingered modes so experiment a little (Press Direct Access and then the Accomp button to get to the controls.)

It works for me very well. Obviously you're not used to it so you don't like it, but once you get used to it it's very easy - perhaps even better than having a dedicated button because you can access the feature without ever lifting your hands off the key bed.

I don't believe there's a way to do it exactly like on the Ketron.

Chony