Jen SX-1000 Synthetone Analog Monophonic Synthesizer

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Jen Elettronica simultaneously released the SX-1000 Synthetone Analogue Monophonic Synthesizer with a 37-key keyboard and the larger Sx-2000 with 44 keys in 1978. 

The SX-1000 is a monophonic synthesizer with a 3-octave, 37-note, (C-C) keyboard and a black or white front panel (they came in two colors). Also called the "Synthetone", the SX-1000 features a single DCO (digitally controlled oscillator), with a four octave range (32', 16', 8', 4') and three available waveforms, sawtooth, square, and PWM (Pulse Width Modulation). White and pink noise are also available, as well as portamento/glide. The filter is 12dB/octave. There are two ADSR envelope generators and one LFO.