Sebastian,
The FRS and FRSX were released in the early 80's along with the Quadrature Oscillator (QUO). The catalog that I had, which was close to the 1982 version posted, had these modules listed. I think I got the catalog around 1983-84.
I think the other modules are new since STS began production.
Scott
Sebastian Kuehnl wrote:
Looking for detailed info on apparently post-1982 modules: frequency shifters
FRS and external carrier FRSX, CV mixer CMX, CV interface CVI, cv processor PRO
as sighted in 2000 price list.