Oberheim SEM

The Oberheim SEM (Synthesizer Expander Module) is a classic analog synthesizer module designed by Tom Oberheim in the 1970s. Originally created as a standalone unit to expand the capabilities of existing synthesizers, the SEM became renowned for its warm, rich sound and flexible architecture. It features a simple yet powerful design, with two voltage-controlled oscillators, a multimode filter, and an envelope generator, making it a favorite among musicians for its ability to produce a wide range of tones, from lush pads to aggressive leads. The SEM has been used in countless recordings and remains a highly sought-after piece of vintage gear.