The reissue of the classic SEM monophonic analog synthesizer expander module.  Originally released in 1974, the SEM is one of the classic discrete analog synths, with a huge, three-dimensional "fat" tone that must be heard to be believed. Tom's reissue cuts no corners- the circuitry is almost identical to original units. The only component changes were made due to unavailable parts, but the great tone has not been affected. No digital voice circuits, or thin-sounding analog "voice chips" here- only genuine hi-fi fat analog goodness.

All internal SEM connections are brought out to 3.5mm minijacks - all 33 of them. The basic connections are a one-volt-per-octave VCO control voltage and a standard 0 to +5 volt gate signal. On this version of the SEM, there is no MIDI input.