And in 1974 Oberheim produced the first polyphonic synthesizer using their SEM Modules ( which were originally designed to allow musicians to just layer more complex sounds together in a monophonic'stack'. ) They produced a key assigner circuit that would assign a note to one of several SEM modules . ( They came in 2, 4 and 8 voice racks eventually . ) When more notes got hit than the number of racks available the latest note would have to'steal'one of the SEM modules from the note it had been assigned to.
