Hi Don M
Here is what I would try. Make sure your Host Select switch is set to "MID". Connect the MIDI OUT A of the 9k to a sound module. Make sure that you can control the module with the 9k keyboard. If you cannot, try various MIDI modes, "All Parts", "Kbd&Acmp", "Master Kbd1" and "Master Kbd2". One or more of these should allow you to control the sound module.
Once you have the 9k controlling the external sound module, connect a MIDI controller to MIDI IN B. Set the Receive mode to "Keyboard". See if you can control the module using the controller. If you can, then the controller data is being merged with the 9k data.
Depending on what the objective is, different settings may be used.
[This message has been edited by Clif Anderson (edited 11-24-2000).]