Repro-1 & Repro-5

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Repro: analogue, meticulously recreated

Repro dives into the past for analogue inspiration, meticulously modelling two famous synthesizers. Every detail of the original was captured using component-level modelling technology to create the most authentic model possible. All the subtle characteristics and quirks found in the originals are present in Repro. One product, one installer, two synths.

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    Repro-1 is a fierce monosynth: The classic design gives you immediate access to all the raw power: Two oscillators, self-oscillating 4-pole lowpass filter, arpeggiator, step sequencer, the unique modulation section, and five stomp-box effects which can be arranged in any order. Hard working, raw sounding and immediately playable, it's a simple and intuitive synthesizer which belies a deep feature set capable of a wide range of sounds.

    Basics and history

    The plug-in is a component-level model of perhaps the most powerful-sounding monophonic keyboard ever built. In the early 1980s, polyphonic synthesizers were almost within reach of the average musician. To be commercially viable, any new monophonic instrument had to be cheap but very capable. Fat drones, cutting leads, funky basses, quirky sci-fi sound effects ‚Äď this synthesizer delivered on all counts.

    The circuit design made good use of standard Curtis chips and the little onboard sequencer was more than just a welcome extra. Despite its molded plastic panel and the limitations of monophony, it sold surprisingly well and is generally recognized as an iconic piece of synthesizer history.

    Basics and history Repro UpstreamSquad

    Our plug-in version includes all the lovable quirks of this classic synth, but with a much more capable sequencer, lots of presets, several under-the-hood tweaks, more modulation options, and as a plus: a great collection of cute stomp-box effects. 


    Tweaks panel 

    Apart from being unashamed eye-candy, the Tweaks page is there to let you change the fundamental behaviour of individual modules. There are 5 user-adjustable jumpers (mini circuit connectors) and 5 module tweak selectors. While on this page, all the main controls of the synthesizer are still accessible.

    Beside the option to modify the synth's fundamental characteristics through jumpers and selectors, the panel also includes access to the Microtuning section with many included presets.


    The sequencer in the original hardware may have been a stroke of genius. Repro-1's version lets you step-record two patterns of up to 32 notes each, which are also saved with the preset and support copy/paste of pattern's presets between different instances of the plug-in.

    Other than having more steps than the original, the integrated sequencer supports per-step velocity, a rest button to add pauses, the ability to record your own sequences through a MIDI controller, and other improvements.

    Sequencer Repro UpstreamSquad


    Repro-1 ships with a set of 5 high quality effects in the shape of stomp-boxes. From subtle to extreme adjustments, this section expands the analogue synthesizer's capabilities beyond expectations.

    The effects section includes Jaws (wavefolder), Lyrebird (a flexible delay, which inspired the creation of Colour Copy), RESQ (semi-parametric EQ or resonator), Drench (a lush plate reverb), and Sonic Conditioner (a stereo saturator and transient designer - to add the right amount of gelatine to your patches). All effects are rearrangeable through drag and drop in the FX Chain section.

    Stomp Boxes Repro UpstreamSquad

    Repro-1 & Repro-5 Key Features

    • Deep feature set delivers a broad palette of vintage analog synth sounds
    • Component-level model of a classic monophonic synthesizer
    • 2 oscillators: saw/pulse and saw/triangle/pulse, with pulse-width modulation and sync
    • White-noise generator
    • Audio-generators mixer with feedback path for massive bass boost
    • 4-pole lowpass filter with self-oscillation, plus cutoff, resonance, envelope amount, and key tracking controls
    • ADSR amp envelope with curve trim
    • Saw/triangle/pulse LFO, waveforms may be combined
    • Bonus modulation sources: AR/ASR envelope, plus Gate and Trigger
    • Arpeggiator: up or up/down, latch mode provided
    • 2-pattern Sequencer with step recording, editable velocity and pitch, per-step note/tie/pause status, copy/paste and rotate functions, preset save/load
    • 5 onboard FX: wavefolder/distortion, delay/chorus, EQ/resonator, reverb, sonic conditioner/dynamics processor
    • Patch from scratch or grab one of 500 killer presets

    Operating System

    Mac, PC



    Bit Depth

    Windows: 32-bit & 64-bit, Mac: 32-bit & 64-bit


    AAX, VST2, VST3, AU, NKS

    Mac Hardware Requirements

    Intel Core i3 or higher, 4GB RAM or more recommended

    PC Hardware Requirements

    Intel Core i3 or higher, 4GB RAM or more recommended

    Mac OS Requirements

    OS X 10.9 or later (Intel and M1 Mac Supported) (64-bit only)

    PC OS Requirements

    Windows 7 SP1 or later
    Our team is ready to help you with any question you have.

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