

While programming and playing these was often impractical, players who owned them would rarely (if ever) say a bad word about them, and they remain desirable to this day. There were three versions of this, two of which were dual-manual monsters with eight SEMs mounted in the lids of their huge cases.

Inevitably, the 4-Voice was followed by the 8-Voice. This was a wonderful instrument each voice was generated by an independent synth module, and the ensemble had amazing depth when you could get it to stay in tune with itself. The SEM's popularity, in turn, inspired the birth of the 4-Voice, in 1975. Nevertheless, it wasn't long before people realised that one or more SEMs could be combined with their own keyboards to create self-contained synthesizers. Introduced in 1974, the Oberheim SEM (Synthesizer Expansion Module) was developed as an addition to a keyboard synth or a sequencer, not as an instrument in its own right.
