I can't offer an accurate description, and would be quite interested to understand the differences myself, but... subjectively, as a P5/P6/Pro One owner, I can sorta somewhat vaguely confirm that the Pro One has its own sound/vibe in the bass department. My Pro One lives in Berlin with my Prophet 6 and I haven't played either of them since the pandemic drove me out of town, but I used to do plenty of A/B-ing, trying to get one to be the other. Maybe the P6 is too clean and too stable, but it never really got the guts of the Pro One bass sound. I love the P6 in its own right, and it became my go-to for bass, as its cleaner sound grew on me, but I'd still find that certain songs worked best with the Pro One. My first P5 was a rev 2, my second a rev 3 and now I've a rev 4. I've always loved the P5 for bass, but again, there's something different that sets it apart, tonally, from the Pro One. Magic sprinkles? Plastic vs wood? Oddly or not, the Evolver gets closer to the Pro One bass sound than the other synths we're talking about here, to my ear anyway. When I finally do return to Berlin, I'm likely to pack up my synths and fly them to California, but I'll certainly download the U-He plugins so's to keep a minimalist setup behind. The Repro plugs feel and sound like the wood and metal machines...