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Presset analog monophonic synthesizer

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Pro/DGX 1Pro/DGX 2Pro/DGX 3Pro/DGX 4Pro/DGX 5
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1 200.00 street price

Pro/DGX is the third generation of Soloist synthesizers. Almost the same as Pro-Soloist, although it got a brighter face and the preset switches were replaced with buttons. The main difference from previous versions is in the filter section.

The first Soloist used VCF ARP4012. This filter is built entirely on discrete elements and has poor thermal stability (roughly speaking: the sound of the synthesizer strongly depends on the weather).

Pro-Soloist used a voltage controlled filter (VCF) ARP4034, built on transistors, combined in a single unit (CA3086). Such a solution made it possible to achieve greater thermal stability and at the same time to have the sound of a discrete transistor four-stage filter.

A newer ARP4075 filter was used in Pro/DGX. It is built according to a hybrid scheme (no, not digital, it is still analog) using transistors (2N5087) and operational amplifiers (LM3900N). This approach allowed the company to reduce the cost of the filter, but the sound was affected. Many users noted that although all presets were identical to PRO-Soloist, they sounded different (worse) due to another filter.

The synthesizer was produced from 1977 until ARP stopped production in 1981. Tangerine Dream and Keane are among the famous users.

Country of origin / production: USA

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More info
Usage area
Usage Design/ Form Factor
With Keys 
Analogue (A) 
Tone Generator / Sound Synthesis
Oscillator Type VCO (Voltage Controlled Oscillator)
Oscillators per voice1
Waveform/ Spectral form (main generator) Saw
Programs/ Voices/ Timbres
Single Voice Preset30
Voltage Controlled Filter (VCF) 
Wah/ AutoWah 
Arpegiator/ Portamento
Type Synth Action
Number of Keys37
Audio out
Analogue: 1/4" (6.35mm)1
Voltage 220V
Voltage 110V
Voltage 50Hz
Voltage 60Hz
Power Supply Built-in, internal
Case/ body
Production start1977
Production end1981
Production ended

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