Alan, I set up my keyboard just as you described in your post, worked very well at home. My experience; Half way through a job I was playing I decided to play a sequence using my KN7, Johnny B Good, using the sub outputs. Before I knew it I was staring at the keyboard, the dancers were staring at me --- the bass and drums were gone.

Lesson for me; Sequences, in areas that I am not aware of, have control of my keyboard. I am sure there is a cure but I have no need to go through that experience again, I have not used the sub outlets since, trying to keep it simple. I have added a powered sub to my two powered JBL 10s. Now no need for the sub outlets.

John C.