Pro Soloist Synthesizer

Also available as part of the new Synth Stack 4 collection!

Pro Soloist is the latest in Cherry Audio's roster of ultimate "what if?" virtual instruments. Featuring the precision-crafted and circuit-modeled DSP designs of award-winning developer Mark Barton, Cherry Audio's Pro Soloist goes far beyond emulating the treasured, preset-based monophonic analog synth originally released by ARP in 1972. Pro Soloist not only exactingly reproduces the expressive controls, 30 presets, and the unique underlying architecture of this prog rock classic, it breaks it out of its cage by making it fully programmable and expanding it with full polyphony, splits and layers, a mod matrix, integrated studio-quality effects, and more.

At the beginning of the 70s, analog synthesizers were just making their way into the hands of working musicians, and their operation was still a mystery to most folks outside of a college music lab. To avert potential user intimidation and bring synthesis to the masses, manufacturers introduced simple monophonic preset synths that were intended to sit atop an organ. ARP Instruments led the charge in 1970 with the Soloist, the first commercial preset synthesizer, featuring 18 presets and basic controls. In 1972, ARP followed it up with the Pro Soloist, updating the analog preset control with a revolutionary digital read-only memory chips (which improved tuning stability) and expanding the preset selection to 30. Most impressive was the introduction of an innovative “touch sensor” keyboard (now commonly known as aftertouch), where pressing harder after playing a note introduces changes to the sound, allowing highly expressive playing. Specifically, the Pro Soloist’s touch sensor controls enabled pitch bend, wow, growl, brilliance, volume, and vibrato.

Cherry Audio has received frequent requests to reproduce this oft-forgotten gem, including from frequent collaborator Mark Barton (GX-80, Novachord + Solovox, Miniverse, and others). He has programmed an incredibly authentic reproduction of the analog signal path and original presets, and together we have substantially expanded the Pro Soloist’s capabilities. Cherry Audio has added a dual-layer voicing architecture, with 16 polyphonic voices per layer, that enables two different presets simultaneously, with independent panning for rich stereo timbres and complex, layered sounds. Pro Soloist also supports a split keyboard mode and an option to simulate polyphonic aftertouch with a monophonic aftertouch controller for more expressive performance possibilities beyond the standard touch sensor effects.

With its distinctive three-panel interface, this Pro Soloist is far more than a preset synth. In Performance mode, each original paddle preset has been precisely recreated with MIDI-mappable switches. In Edit mode, we’ve exposed all of its unique analog synthesis architecture parameters, most notably, the fully-variable, five parallel bandpass filter “Resonator Bank” - the key to the Pro Soloist’s realistic acoustic orchestra timbres. Additionally, we’ve revealed the LFO and ADSR/AR envelopes used to create the presets, and elevated the sound design and performance possibilities with a "Super Wave" oscillator and a powerful six-slot modulation matrix. The Arp/FX mode rounds it out with a syncable arpeggiator and a dozen studio-quality effects for distortion, phaser, flanger/chorus, echo, and reverb.

In short, Cherry Audio has elevated this somewhat bare-bones monophonic lead synth into a massive, polyphonic powerhouse beyond anything imagined 50 years ago.

Pro Soloist Features

• A best-in-class virtual instrument based on ARP Instruments' 1972 preset-based monophonic analog synth
• Exactingly reproduces the expressive controls and 30 presets, and surfaces the unique underlying analog synthesis architecture to make it fully programmable
• Massive dual-layer voicing architecture with 16 polyphonic voices per layer: two different Pro Soloist style sounds simultaneously playable, in either a keyboard split or stacked layer mode, with discrete controls for layer volume and panning
• Three-panel interface: Performance mode, with the original paddle presets; Edit mode, revealing all of the original's unique analog synthesis architecture parameters; and Arp/FX mode
• All Pro Soloist voicing parameters reproduced and exposed, including the five parallel 2-pole bandpass filters of the Resonator Bank, expanded with individual frequency curves
• Touch Sensor Effects controls to apply aftertouch to volume, brilliance (filter), and portamento, with adjustable touch sensitivity
• Mono (retrigger or legato, low or high-note priority) and polyphonic modes, with a "last" note option to simulate polyphonic aftertouch with a monophonic aftertouch controller for more expressive performance possibilities
• Voltage-controlled oscillator with sawtooth and pulse waves, plus a "Super Wave" option for fatter tones
• VCO modulation with ADSR PWM, AR PWM, LFO PWM, and LFO FM
•  24dB/oct Voltage-controlled filer (VCF) with filter invert and modulation with ADSR, AR, LFO, Growl (a specialized low-frequency oscillator), velocity, and keyboard tracking
• Voltage-controlled amplifier (VCA) with modulation by ADSR, AR, LFO, and velocity, and independent per-layer control over volume and panning for expansive and breathtaking stereo tones
• Tempo-syncable LFO with sine, ramp, sawtooth, and square waveforms
• Resonant highpass filter with cutoff frequency from 20 Hz to 1300 Hz
• Resonator Bank with five parallel bandpass filters with continuously variable frequency and resonance controls, all individually modulatable via the Mod Matrix. The frequency curves of the originals are provided and any of the resonators can be set to individually to any of the curves, in any combination.
• ADSR (attack/decay/sustain/release) and AR (attack/release) envelope generators
• Powerful but easy-to-use Modulation Matrix with six slots and simple click-to-assign functionality: 22 sources and 58 destinations, including Pro Soloist's integrated effects
• Arpeggiator with MIDI tempo sync with Down, Up, Up/Down, and Random
• Panel Control for selecting layer controls, including utility functions for duplicating and exchanging synthesis and effects parameters between layers and presets
• Preset Paddles includes each of the 30 original Pro Soloist factory presets
• 450 presets created by a talented team of sound design veterans, easily accessible in a convenient preset browser
• 12 studio-quality integrated effects: distortion, 2/4/6/8 stage phaser with sync, flanger/chorus with sync, three types of stereo echo/delay with sync, and five types of reverb, with easy-to-access global or layer settings
• Complete MIDI control and DAW automation for all controls, with easy-to-use MIDI learn and mapping (Preset and Global)
• Cherry Audio's popular Focus zoom-in feature, as well as standard UI zoom and resize via drag
• Complete documentation available directly online from the instrument or in downloadable PDF format
• Highly optimized DSP for optimal performance
• User-adjustable oversampling control

Also available: Vintage Vibes for Pro Soloist Preset Pack (sold separately), featuring an additional 100 presets by sound designer James Dyson showcasing more of Pro Soloist’s use of touch sensors and aftertouch, modulation, splits and layers, outstanding arps, atmospheric pads, stunning sound effects, basses, keys, and leads, and brass.

Pro Soloist is available in AU, VST, VST3, AAX, and standalone formats.

A free 30-day demo of Pro Soloist is available. This demo will play white noise periodically, but is otherwise unlimited.

macOS Requirements: macOS 10.13 or above. macOS 13 Ventura supported. 64-bit required. Native Apple M1 or greater processor support, including Ultra. 3.4 GHz Quad-Core or M1 CPU with 8GB of RAM recommended.

Windows Requirements: Windows 7 or above (including Windows 11), 64-bit required. 3.4 GHz Quad-Core computer with 8GB of RAM recommended.

Hard disk space: 105 MB

NOTE: Internet connection required for product activation.

ARP is a registered trademark of KORG Inc. There is no association, affiliation or endorsement of Cherry Audio or its products by KORG.