via this auction
"This version has the MIDI interface, but not the extra outs of the SEMPro. Serial 0187. Bought May 2010.
The Synthesizer Expander Module is a remake of a 1970's product and retains most of the circuit designs of that unit.
It is most famous for its continuously variable filter state from lowpass through band reject to highpass. Bandpass is on a switch. All knobs are pots on the synth side."
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