Interesting piece. Title link takes you to more. "In 1969, Salvatore Martirano along with a group of engineers and musicians at the University of Illinois began work on the design and construction of a musical electronic instrument. The instrument, named the SAL-MAR CONSTRUCTION, is a hybrid system in which TTL logical curcuits (small and medium scale integration) drive analog modules, such as voltage-controlled oscillators, amplifiers and filters.
The performer sits at a horizontal control panel of 291 lightable touch-sensitive switches (no moving parts). The two-state switches are used by a performer to dial sequences of numbers that are characterized by a variety of intervals and lengths. A sequence may then bypass, address, or be added to other sequences forming an interlocked tree of control and data according to a performer's choice. The unique characteristic of the switch is that it can be driven both manually and logically, which allows human/machine interaction. The most innovative feature of the human/machine interface is that it allows the user to switch from control of macro to micro parameters of the information output. This is analogous to a zoom lens on a camera."
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