Interesting to be sure, but for me at least kind of begs the question why?.... Is there really a use case that would require someone to need more than 500 sounds in the timespan before they have a chance to load more banks into it? And if so, wouldn't it be just as feasbile to have a laptop and librarian handy and be done with limit entirely? But I may be overthinking it...I also wondered why not just download the factory patches from the support page (regarding the original thread topic) and load them to the synth, but then I thought to myself I may have trapped myself in a recursive, overthinking loop
500 user slots is a comfortable amount I think, personally. On synths with more limited space, I would totally get it.
Yeah, for the great majority of users there's plenty of user slots -- But if you have an instrument for many years, and create lots of patches, space does fill up over time. I have personally done this on my Rev 2 and Pro 3, as I've created ~400 patches for both, and was running out of space for new ones.
With the Prophet 6, it has a simpler sound engine, with less potential variety for sound designs, so I don't expect I'll ever need to do so... but maybe.
The other use case is if you wanted to take the factory presets, rename them with standard prefixes (BAS, STR, LED, BRS, PAD, etc) and then reorganize them so that similar style patches are grouped together, you could do that in User Banks, then copy them back over to the factory banks, just so you have all the factory sounds grouped with prefixes.
(It would be nice if Seq implemented some patch-type TAGS that could be applied to each patch, and have a way to search/sort patches by category. When working in a session with other players or producing a part, its very helpful to have similar sounds grouped when you need to find that perfect bass or pluck or string sound quickly.)