VEB Vermona Synthesizer Analog Monophonic Keyboard

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The analog and monophonic Vermona synthesizer appeared much later, as polyphonic synthesizers had already been on the market for several years and the digital era had already begun. The synthesizer was first built in-house by engineer Berndt Haller in the 1970s and then taken over by Vermona. The company produced a total of around 1000 units by 1998, most of them for export to the USSR.

The synthesizer has a manual with 44 keys for 3 1/2 octaves. The sound is generated in subtractive synthesis by 2 VCOs, each with an octave switch at 32', 16', 8', 4', 2', which can be combined. These generate the waveforms pulse, square, sawtooth and white noise, which are activated with a separate switch. The VCF with 5 presets is a 4-pole low-pass filter that influences the timbres without resonance, with a control for the intensity of the envelope modulation. With resonance, the cutoff becomes a bandpass filter. The VCA, which also has 5 presets, is formed by attack, decay, sustain and release. The LFO triggers vibrato by modulating the VCO and a wow effect by modulating the VCF. 
(Source: Keyboard, Vermona Manual)