The thing is, okay, room for 1000 user styles, but is the style format capable of reading other brands’ formats, or need a ton of work even if it can?

Being such a new brand, I doubt there’s a ton of stuff out there yet and little at pro ROM level.

I’d be interested in how good and quick the style header editing is. If Roland had an edge in any area, it was that one for sure. And if you import a lot of off brand and amateur user styles, it’s the area that can make or break whether that’s practical…
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An arranger is just a tool. What matters is what you build with it..!