The first thing you need to understand is what kind of instrument are you trying to emulate. Is it an ARP? a Moog? a Prophet? Understanding the synthesized instrument goes along way in determining what waveforms you need to use in the Kurz in order to start programming the emulation. I have no idea what instrument ELO was using back in the day; without that knowledge it becomes 10x more difficult to program something.
As an example on some of the Pink Floyd albums Ricky Wright used an EMS/VCS3. Knowing this I would start with program 1011, which is a monophonic PWM Lead; I might also need to layer in a Saw lead like program 1018. I might also want to add an effect like a echoplex delay (chain 917). So it helps to know what instrument you are trying to emulate before you begin or you can spend hours of frustrating time trying to stumble onto something.