I was poking around Youtube last night and came across an audio interview with Tom Fowler, done in the mid-1990s. He was part of my favorite Zappa/Mothers lineup, and so it was pretty entertaining hearing him speak candidly about that. He also gets into his subsequent experiences working with Jean-Luc Ponty and Ray Charles. Definitely worth a listen, if you're into that stuff!
Part 1:
Part 2:
Part 3:
Part 4:
Part 5:
I noticed there's also an interview with Bruce Fowler up there from about the same time, but haven't had a chance to check it out yet...