I'm fully aware that many people who've run into this blog came here solely for my discoveries with the RolandCloud VST's, and because of that, I've been hesitant to disclose it, but I suppose it is time: that's not the only project I've been caught up with insofar as Roland gear.
A year or two ago I was informed of this third-party product that makes it possible to read and write SR-JV80 ROM images. While I did ultimately buy both the programmer and a spare blank expansion card by them, it was clear what was currently known about the ROM's format was limited from what the product pages originally said, so I took it upon myself to do some disassembly and reassembly work.
Having finished up that aspect, and acquired a JD-990 for additional testing, I can verify that it is possible to create your own SR-JV80 ROM images if desired via a GitHub repo. I make no claims that the process is perfect, especially given the nature of delta PCM audio, but as crude as it is, it works, which I know for a fact having tested with E-mu Proteus samples loaded up in the video at the bottom of this post.
That's one of the projects I admit I've been caught up with lately. I promise I will try to update this blog again within the next month or so with at least one of the others.