I have a KN7000 and have had the same problem. It wasn't the keyboard, but my ignorance in setting it up.
If all your parts are on the right channel, try the presets,which configures your communication with a computer or module,slave or master,etc.
It seems that it can be configured so many ways that it takes a lot of trial and error if you don't know what you're doing. I am sure you are more experienced than I, but I can use controller keyboards with ease, and hit a brick wall with the Technics.
pa4X 76 ,Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact