@lore I remember an interview with A Guy Called Gerald where he used at least two 101s, a few 303s and an 808 for Voodoo Ray. He described how they would just make it work and went on to say, in essence, that computers make it much easier.
For some applications, Acid, the amount of equipment required is absolutely absurd when chasing those unique sounds. Yeah there's still a demand for the equipment and last I checked there are parts kits for making them. The kits were designed by people wanting that sound and honestly that's the only way to get one anywhere near affordable.
So I see someone learning how to build a synthesizer but not using ancient tech to do it. That's fantastic and congratulations on your progress.
It might not sell very well because it's not made with parts from the 80s nor is it every synthesizer ever made but new. It seems like a difficult product to sell.
To keep the same theme, it makes sense to make it expandable. A cheap tablet with a minimal OS could add even more capability to it but so would an SBC.