You know I forgot that I had read about the fall of some of these companies in "Vintage Synthesizers" by Mark Vail. Tom Oberheima left due too cash flow propblems. Sequential was hurt by makeing the Sixtrack/MAX/ and Multitrack, Plus with Korg's Release of the DSS-1 Sampler hurt sales of the Prophet 2000. Alesis is actually American.

You know I think I just answered my own question.