Hi,
Just a thought but Walt Tenay had some books left by Alec Pegada, the real guru on KN keyboards it may be worth contacting him at Email :keyboards@bellsouth.net Sales are on Tel:-1-800-706-1088 and tech help is on Tel:-1-828-287-5321.
He has helped me in the past over here in England.
Best of luck John (jd5live)