I can feel the frustration you and others are having, especially the Audya 4 users.
Even with the Audya 76 I find the manual is very detailed in what they cover, but there are things not covered.
Maybe I am being optomistic, but am thinking Ketron was so intent on getting their product out and workable, and they put out a basic manual. I don't think that they don't care as much as priorities, and those of us with problems have different ones than they.
pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact