That's a great question Mike. I hope AJ can chime in here also.
In my understanding both MJPro and SD40 can be fitted with large capacity SSDs.

I might received my SD40 around mid November with new OS. I'm excited. Let's see what happen.

Btw, Mike how's the Voicetron on your SD40?
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Jim

SD90,Korg I3, KMA Liverpool,TC Helicon Play Electric, Fender Sonoran Guitar, vArranger, Bose S1 Pros, Bose L1 Compact, Aiwa Exos-9