Hi Don. First of all, congratulations on your purchase(?!) of a Ketron Midjay. Your QUESTION: "Is there a way to do more, such as use the buttons (on the WK3000) to activate fills on the Midjay" is exactly the question I've been wanting an answer to as well.

The concept of a small arr module connected to a 76 note kbcontroler is especially appealing for both lightweight portability & having 76 keys. Unfortunately, accessing arranger functions from the Midjay itself seems (to me) awkward, especially since many of the Midjay's buttons are DUO FUNCTION, meaning you have to remember what function the specific button is currently assigned to before pressing it. This makes the ability to trigger arranger specific functions like 'fills' , 'variation changes' and 'intros/endings' directly from the Casio WK3000, or a keyboard controller which includes assignable arranger function buttons, that more IMPORTANT.

Realizing that Scott Langholff owns a Midjay, curious to hear from him (or other Midjay owners) about the success of acheiving this. Scott, are you still happy with the Midjay? Which keyboard(s) (Yamaha PSR3000, Tyros, or Ketron Midjay) are you planning to keep/sell?

ScottY