GForce Software OB-E review | MusicRadar

What is it?

Back in the day and before polysynths became a thing, Oberheim upscaled its SEM (Synthesizer Expander Module) monosynth into a number of multi-module designs. The most ambitious (EVS-1) used eight SEMs and was better known as the 8-Voice. 

This delivered 8-note polyphony where each voice was basically a different synth and could therefore create rich polytonal sounds. But things moved on and Oberheim developed a synth (the OB-X) that achieved polyphony in a more efficient fashion.