Well, I'll come at this thread from a couple different angles. As someone who decided to play bass after going to a Brothers Johnson concert and as someone who owns two Alembic Series basses ( a 1 and a 2) as well as two pre-Ernie Ball Music Man Sabres. I have on more than one occasion gotten my Series II lost in the tone mix. It's not because the bass isn't capable, it was because the guy doing the EQ (me) was clueless. The bass has so much range you can dial it from twang to thunder with just a couple tweaks of your right hand. In that video, Louis obviously had it biased towards twang. His pops were crisp, but his bottom end was getting lost.
The tone he had on the Stingray clip was vintage Louis. But so is the tone he gets WHENEVER I've heard him play Strawberry Letter 23. And I've heard him play it live with an Alembic, a Stingray, and a Treker.
As sweet as my Sabres are, especially the 1980, they cannot handle the range of my Alembics, especially the Series II. In all honesty, that bass probably doesn't really even sou d like what most people think the "Alembic tone" is. I've had 6 Alembics over the years, including an older Series II. None of the others sound similar to the this one.
Back to Louis.....over time, he appeared to gravitate to whomever he could work out a good endorsement deal with. After Alembic he went to Music Man, then G&L, then he was playing some headless bass that I can't identify then Treker. Don't know what he plays these days.
And Jermaine????? Remember this album?