I have this in my garage right now, the control tech team issue. Yeah control tech made these frames in Kent, WA, they also made some of the Ibis Szazbo's
1996 or 1997? I had a 1996 and it had the smaller diameter pivot at the union between front and rear triangles. It was my understanding that the 1996 models were made by ControlTech for Schwinn.
I wish I had never sold my 1998 S-Carbon. It fit me as perfect as any bike I'd ever had. Besides the fact that it sucked as a full suspension design, the unified rear triangle made for an awesome "soft-tail".