Roland-arranger.com
But read the manual first. Are you trying to have this sound just for a specific Performance, or available when you want it on any setup?
If the latter, read the section on 'Favorite Tones'. For each Keyboard Part, you can set it up so eight of your favorite sounds can be called up quickly.
That's a DIFFERENT eight for UPR1, UPR 2 and LWR... So all in all, quite a selection. Be advised, though - you can only call up ROM sounds this way. If you want to edit a sound extensively, and have that available, you can't use the Favorites (damn!). You will have to have a Performance that calls that up...
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An arranger is just a tool. What matters is what you build with it..!