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ARP | Pro-Soloist |
Description | The Pro-Soloist is a thirty preset monophonic analog synth from the early 1970's, originally designed to sit on-top of, and accompany a large Organ. It had 30 preset sounds to choose from, including Flute, Bassoon, Brass, Fuzz Guitar etc. Other features included pitch, portamento, vibrato, growl and wow effects. The keyboard has 37 keys with aftertouch sensitivity for volume, brilliance, vibrato, wow, and even bend effects. A few basic filter (brilliance), envelope and LFO controls allow some tweaking of the preset sounds, however there is no memory to store your settings. The Pro-Soloist is a compact and basic monosynth best suited to leads. Because of its aftertouch feature, it's simply one of the most playable and expressive solo instruments Arp ever made. It was later followed up by the Pro/DGX in 1977. The Pro Soloist features a single oscillator, which generates simultaneously available pulse and sawtooth waveforms. The sawtooth wave is not a separate oscillator circuit, but instead is derived from the sum of 5 pulse waves, generating a 64-step "staircase" waveform to emulate a sawtooth pattern. The 24dB/oct low-pass filter, ARP part no. 4034, was very similar to the Moog ladder filter, and was eventually replaced due to a patent infringement claim by Moog. |
Brand | ARP |
Model | Pro-Soloist |
Device | Synth |
Type | Keys |
Engine Type | Analog |
Engine | VCO Preset |
Voices (max) | 1 |
Oscillators | 1 |
LFO | 1 |
Engine Detailed | 1 VCO |
Filter (VCF) | 1 slider "Brilliance" |
Envelope (VCA) | Yes |
Memory | 30 Preset |
Keys | 37 |
Key type | Keys |
Velocity | No |
Aftertouch | Yes |
Extra info | The Pro-Soloist was based on the Soloist from 1970/71. The Soloist was designed to sit atop an electronic organ and had its preset sound selection switches located under the keyboard. |
Produced: | 1970 - 1977 |
Legend: | Obvious | Y: Yes, N: No, N/A: Not Applicable | |
VCO | Voltage Controlled Oscillator | DCO | Digital Controlled Oscillator |
LFO | Low Frequency Oscillator | Sub | Sub Oscillator |
VCF | Voltage Controlled Filter | VCA | Voltage Controlled Amplifier |
Velocity | As with a piano, the harder you hit a key, the louder the sound, unlike most organs which always produce the same loudness no matter how hard you hit a key. | Aftertouch | Pressing a key after you activated it. Channel Aftertouch, no matter which key, it will send a Channel message. Poly Aftertouch, sends the pressure per key instead of the whole channel. |
Values for OSC, LFO, Filter, Envelope are per voice unless stated otherwise. |