I recall an article in Bass Player in which Jason Newstad (Cliff Burton's replacement in Metallica) spoke of owning and recording with a half-dozen Alembics. This would have been around the black album era in the early 1990s.
Nice catch with the Cammack connection, Edwin. His playing on that album is boggling, but when I saw Ahmad Jamal about nine years ago Jim was playing a traditional upright.
Peter Steele of Type O Negative is an Alembic player. Saw them in concert and his big, long scale Alembic looked like a toy on Steele, a 6'7 bodybuilder.
Paul (another one)