
via this auction
SYNTH-E Saves the Day comic strip and pics of the inside below.

The Synthi-E was designed by Tim Orr as an educational version of the Synthi that had a complete teaching course built around it for use in schools. It was intended as a teaching aid into the principles of sound synthesis and electronic music. Small, housed in a brief-case and D-battery powered, the Synthi E was perfect for the student or teacher on the go! Simple as it may appear, it actually has some sophisticated features:

-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
-Modulator for envelope shaping or ring modulation
-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 (2) for obtaining control voltages. One slide-tape is stepped and may be used as a keyboard and the other for variable control. One provides a trigger pulse. Both may be temporarily marked or written on
-Inverter to invert control voltages or signals
-Monitor Amplifier and Loudspeaker with two input mixer faders
-The optional 3-octave keyboard for controlling the Synthi E. This unit is a mechanical keyboard which plugs into the Synthi E. It provides the correct pitch voltage and trigger signal for the Trapezoid Generator. A switch on the Synthi E selects internal or external keyboard operation.
Modules:
- VCF 144/1 (Issue F)
- VCF 144/2 (Issue F)
- L.F. OSC 144/3 (Issue E)
- Input Amp Env followr 144/4 (Issue E)
- TRAPZD GEN 144/5 (Issue F)
- VCA O/P AMP 144/6 (Issue G)
This unit is in excellent working condition, and it sounds incredible."