Seems like both sides have a slightly different take on the parting. Rick only says he left. Alembic says he was fired.
I don't think Rick felt the Alembic guitars were a complete success. I felt the same way. They seemed kind of sterile.
They sure made some great sounding basses though!
I've never been into Jerry Garcia's electric guitar tone but a lot of guys love the way he sounded with a Strat.
But that Strat Jerry used had an Alembic pre-amp in it that Rick Turner designed called a Stratoblaster. That's what gave it that sound.
Least I think Rick designed it.
EDIT: Nope. Rick didn't design it. But he does refer to Ron Wickersham as being "my then-partner".
Here's a quote from Rick about the Stratoblaster: "The original was designed by my then-partner, Ron Wickersham, and yes, Lowell George used one...that's the sound, into a Dumble...on Waiting for Columbus. I put one in Lindsey Buckingham's Strat for the Rumours sessions; that was pre-Model 1. It's a great circuit...still...after more than 30 years."