The "Factory Presets" that come with Arturia's Jupiter 8 V2, Leave a lot to be desired. Why? It's not because the software is not a good imitation of the keyboard. But instead, because these presets have nothing to do with the original factory presets. I downloaded the "factory" preset sheet and noticed that the "Factory Presets" were not matching the ones that came with the original keyboard. On this preset I have the factory presets 11-18 which are as follows:
For a description and sound samples go here http://www.synthmania.com/jupiter-8.htm
These are for the V2 but should work for V1. Why haven't you changed to V2?. If there is more interest I'll post the rest eventually.
In these presets there is a lot of negative envelope and sync capabilities of the Jupiter 8 which gave it a very different sound than a Mg for example...