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Oddly, despite being massively rarer, I don’t think the SFX-6 fetches the same prices as the SFX-60+ mk2. Maybe the userwave functionality is a deal breaker.
Re: the MD, there’s a pretty amazing reverse engineered community firmware project. I haven't tried it yet but it looks like it brings some really interesting stuff like chromatic tuning and surfaces some unreleased synth engines.
https://www.elektronauts.com/t/machinedrum-sps1-uw-x-06-released-unofficial/159097
Long may it continue, the SFX6 must be worth a few quid now.