I used to have an SL-20 and it was bonkers fun. Putting a Future Impact ->OC2 ->SL-20 chain together was synthtastic. It was the size of a small house though, so this format is very cool.
Very lovely indeed. But for completeness "bass only" in this context = bass and keys. So not only is it funky goodness, but lovely ensemble playing. Above all, for me, it is Jaco's note placement which keeps me coming back.
I had an Audere pre in my long suffering MTD Kingston a long time ago. There was a variable impedance switch in it. When I hit that the bass spoke with the voice of thunder. Then I changed it. And then I changed the pickups. I should not have. I looked into buying one recently but couldn't find one without doing an import from the US.
I once plugged an amp into a big Boogie cab and a Warwick 6 x 10. I know that new drivers have more this and that than older drivers. But big boxes make the air wobble.
I have never edited video in anger, but my son borrowed my M1 13" MBP (16G RAM) to edit a 4 camera 4K shoot. Obviously it did not all happen in 10 seconds, but he was massively impressed coming from an i9 Windows laptop with lots of RAM which was just dropping things all the time and being generally unhelpful. For him it was the smoothness of the operation. There was no fuss from the machine at all. A 2nd hand M1 16G Mac Mini can be 650 on ebay if you hang around a bit. Unless budget is an issue (and when is it not?) then I would not consider anything older than an M1.
Jaco. But not for the tone, or for the chops (I would have, but....). I hear his syncopations in what I play. Not the fast stuff or anything we would recognise as "Jaco".
Final piece of advice, make sure you get the impressions done with a thing that keeps your mouth open. I was on my 4th set before I learnt about this. It gives a much better seal.
My hearing is too compromised to get excited about loud any more. But deep is The Bomb. I had an ACME 12" which was appreciably bigger than the "standard" 12" cabs. It went beatifully deep.