Dan, did you know that drawbars have been developed in a .sf2 format, by Paul Stratman, in jOrgan. I don't know if you have heard on jOrgan, it is developed by Sven Meier, and is free to use by anybody. It is an organ simulator that works in Java.
Is it possible to somehow make the drawbars work in vArranger2 with this soundfont, so that people that do not own a Ketron module can also have this functionality?