via this auction
"Designed by Tim Orr for 'EMS', this remarkable D-battery powered synthesizer comes in its original briefcase format. Most experts approximate that less than 200 of these units were made, largely for educational institutions.
Case measures 18" wide x 14" tall x 5" deep (approx. 45.5cm x 35.5cm x 12.5cm).
It's not our area of expertise, but here are the features we've managed to identify:
*Input Amplifier with low (Microphone) and high (line) level inputs.
*Envelope Follower, providing a voltage proportional to the amplitude of the input.
*Oscillator 1, with true exponential voltage control of frequency and three simultaneous output waveforms (sine, triangle and voltage controlled pulse).
*Oscillator 2 for slow control voltages such as glissando or vibrato.
*Filter/Oscillator 3, with v.c. low, high and band pass filter or pure sine wave.
*A Modulator for envelope shaping or ring modulation.
*A Noise Generator.
*Trapezoid Generator, for multiple simultaneous trapezoid waveforms. These may be used for envelope shaping (trigger mode) or for low frequency waveforms (free run mode).
*Manual-Slide tape Controllers (x2), for obtaining control voltages. One slide-tape is stepped and looks to be used as a keyboard, and the other for variable control. One is said to provide a trigger pulse.
*An Inverter to invert control voltages or signals.
*A Monitor Amplifier and Loudspeaker, with two input mixer faders.
Comes 10 original patch cables and a 1/4" jack plug. Also presented with its original lock key..."
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