As the modern successor to the legendary Pro-One, the Sequential Pro 3 monosynth represents the company’s most powerful and full-featured synthesis architecture to date. Drawing on decades of innovation, this instrument unlocks sonic possibilities inconceivable on any other synth.
The Pro 3 synthesizer is a supersonic science lab with its powerful array of tone-shaping tools. Combining wavetable and analog oscillators, three distinct analog filter types, and 3-note paraphonic operation, this instrument opens up new synthesis frontiers for exploration.
Dive into the Pro 3’s full spectrum of shape-shifting wavetables, while simultaneously basking in the organic warmth of analog synthesis. This unique combination invites you to craft new sounds that are both groundbreaking and timeless.
At the heart of the Pro 3’s dynamic sound are its three analog filters: a low-pass design inspired by the original Prophet-5, a classic transistor ladder, and a 2-pole SEM filter that can morph between modes. This trio of filters makes the Pro 3 voice path one of the most powerful and flexible of all Sequential synthesizers.
The Pro 3’s versatile synthesis engine makes it the perfect choice for a wide range of musical genres. Check out this audio demo made entirely with Pro 3 and experience its remarkable sound for yourself.
Pro 3 demo song “Tusker Bunch” by Peter Dyer
All sounds created with Pro 3, including drums
At the moment of inspiration, who wants to be pulled away from their instrument? With the Pro 3’s comprehensive onboard pattern sequencer, you can capture ideas immediately, then quickly add expressive modulations simply holding the Play button and twisting a knob.
The Pro 3’s extensive I/O options make it the ultimate command center for your electronic music studio. With multiple CV/Gate inputs and outputs, it seamlessly connects to modular systems and vintage synths, while its MIDI I/O ensures compatibility with all your modern gear.
The Pro 3 is available in two tasty flavors: one with an adjustable top panel and one without. In an homage to classic analog synths, the controls of the Pro 3 SE can angle upward, providing enhanced visibility and easy access to the knobs during sound design and performance.
Oscillator 3 features digital wavetables that expand your sonic palette beyond traditional analog waveshapes. It includes 32 factory wavetables, each containing 16 unique waves with smooth morphing for dynamically evolving timbres. Sequential also offers a web-based Wavetable Generator utility to convert single-cycle waves into Pro 3-compatible SysEx files, ensuring easy integration of up to 32 custom wavetables.
The Pro 3 synthesizer supports Patch Morphing, allowing musicians to seamlessly transition between two distinct programs in real-time using performance controllers like the touch slider and mod wheel. This expressive capability enables users to “play” the morph, creating complex and evolving sounds that surprise and inspire.
“It’s a powerhouse of sound design with its own unique voice and endless possibilities.”
MusicRadar –
Media Publication
“I was instantly in love. Every sequence, every sweep of the filter, all the modulation. It was amazing.”
Jeremy Blake –
Artist, YouTube Creator
“It’s incredibly powerful.”
Nick Batt, Sonicstate –
YouTube Creator, Media Publication
© 2025 Sequential LLC
The Distortion knob brings warmth, harmonic richness, and an aggressive edge to your sounds, making Pro 3 perfect for screaming leads, growling basses, and even dynamic drive modulation experiments.
The Pro 3 synthesizer offers two unique Glide modes: one based on the absolute time it takes to transition between notes, and the other based on rate, which alters the amount of glide you hear depending on the distance between the notes.
Meanwhile, pressing the Hold button offers a quick and easy way to sustain notes without tying up your hands or feet, offering more opportunities for real-time modulation using the Pro 3’s ample knobs and performance controls.
The Pro 3’s comprehensive modulation section allows you to add depth, movement, and complexity to your patches, making each sound uniquely expressive.
The LFOs are versatile modulation tools that create vibrato, tremolo, and other expressive effects, shaping the Pro 3’s hybrid analog voice. Additionally, the LFOs can operate at audio rates, producing extreme timbral shifts with a distinctly modern edge.
The Pro 3 features a position-sensitive, latchable Touch Slider that allows for both finger sweeps and immediate position jumps. This enables discontinuous modulations and offers new expressive possibilities, distinct from the standard pitch and mod wheels.
The Pro 3 provides a wide range of effects options, from the classic BBD delay and super plate reverb to the intense ring modulator and rotating speaker effects, adding depth, movement, and unique character to your sound. You can push boundaries even further by modulating effect parameters, creating wild, otherworldly environments never heard before.
The Pro 3’s dual voltage-controlled oscillators provide a warm and solid analog foundation, while its wavetable oscillator introduces a modern digital twist, creating a sound that is simultaneously cutting-edge and classic. You can even import custom wavetables to craft sounds uniquely your own.
While the Pro 3’s most frequently used controls are on the front panel, the display enables precise adjustments to parameter values and provides menu-based access to global settings with clear visual feedback. This makes it faster and easier to understand the synth and edit its sounds more deeply.
The Pro 3’s mixer section lets you balance the volume levels of the synth’s sound sources, enabling a wide range of layered sounds and blended textures. You can even push levels into saturation and distortion, and process external audio through the Pro 3’s filters and effects.
The Pro 3 features a 3-octave, semi-weighted, premium keyboard with aftertouch, offering exceptional playability and expression.
The Pro 3’s superpower stems from the ability to choose between three vintage-style filters. Filter 1 draws inspiration from the iconic Prophet-5, while Filter 2 features an enhanced transistor ladder design. Filter 3 is a true Oberheim SEM™ 2-pole filter, which you can continuously vary between low-pass, notch, and high-pass modes, in addition to a selectable band-pass mode.
The Pro 3 boasts a powerful sequencer with 4 separate 16-step phrases that can be chained in series. Each phrase has 16 parallel tracks to control oscillator frequencies and modulate synth parameters. Tracks support rests, ties, and per-step ratcheting, as well as 3-note chords in paraphonic mode. Normal, gated, and trigger playback modes offer flexible performance and synchronization possibilities with external audio and MIDI devices.
The Pro 3’s arpeggiator generates dynamic patterns in response to your playing, and by using the Hold function, you can free up your hands for tweaking other parameters on the fly. It’s an expressive and inspiring tool for adding motion, rhythm, and complexity to your music.
The Pro 3 provides versatile Filter, Amplifier, and Auxiliary envelopes that you can use to modulate nearly anything in the synth – or beyond, via the CV outputs. You can even set the 5-stage envelopes to loop, transforming them into dynamic rhythmic effects.
Pro tip: Use the flexible Aux envelope and its powerful delay stage setting to introduce timbre changes even after the note has begun sounding.
Tuned Feedback offers the ability to create your own flanging and chorusing effects and can even implement Karplus-Strong (a unique synthesis approach that combines filtering, delay, and feedback to create string-like tones).
The Pro 3 features MIDI DIN and USB connections, enabling seamless communication with other instruments and DAWs. In addition to the standard MIDI In and Thru jacks, it includes two MIDI Out jacks, offering flexible control options for downstream MIDI devices. This setup allows you to send the sequencer output independently from keyboard notes, for example. Whether you integrate it into a synth ensemble or use it as the central hub of your studio, the Pro 3’s extended MIDI connectivity offers a powerful and versatile means to control your music gear.
These input jacks allow you to connect foot pedals to control sustain, volume, filter sweeps, and other modulations, enhancing your expressive performance capabilities.
The Pro 3 is equipped with four CV inputs and four CV outputs, enabling volt-per-octave communication with modular and vintage synthesizers. This allows the keyboard, sequencer, and modulation sources to control external instruments, while the synth engine can also receive modulation signals from them, opening up a whole world of sound design and composition capabilities. Whether you need a dual voltage control slew limiter for subharmonic generation – or any other advanced modulation setup, simply patch it in.
The Pro 3 allows you to process audio through its filters and effects, and it even includes an envelope follower, enabling you to use the input signal level as a control source. If you want to sidechain a kick to control the level of a paraphonic pad or explore other creative audio processing techniques, the Pro 3 provides the flexibility to achieve it.
The Pro 3 SE features a hinged top panel that can be positioned at multiple angles, making it effortless to access the controls from any position. This flexible design ensures that your creative process remains smooth, intuitive, and comfortable.
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