Applies to: Nova, Nova II
You need to use the Nova II in it's Performance mode. Programs can then be assigned to any of the 6 parts of a Performance. Download the help pdf " a guide to using the Supernova II Multitimbrally with a sequencer" for full detailed instructions. (Any references within this help pdf to 8 parts should be read as 6 parts for the Nova II)
The guide can be found here.