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Synth (Modular) Plugin by SoloStuff
SoloRack by SoloStuff is a Virtual Instrument and a Virtual Effect Audio Plugin for Windows. It functions as a VST Plugin.
System Requirements
Current PC running Windows XP or above.
At least 1GB of RAM
32-bit or 64-bit VST compatible host (DAW)
Copy Protection
Serial Number
Important Note
In Bitwig, The Reset function of the SA03 (MIDI to CV) module does NOT go to high voltage when you press STOP in Bitwig. This is because bitwig seemingly doesn't behave like other DAWs in the sense that it will not TELL the plugin when it goes to zero position.
My KVR - Groups, Versions, & More
8 KVR members have added SoloRack to 6 My KVR groups 8 times.
Not In Your MY KVR Groups
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KVR Rank

Overall: 3836   3677

30-Day: 1904; 7-Day: 1892; Yesterday: 8599

SoloRack is a modular synthesizer that mimics the usability and functionality of hardware Eurorack modular systems. Whether you are an experienced Eurorack user or strictly a software user you will most probably find something new within almost all modules available. A large variety of modules are available, designed with attention to detail. Keeping familiarity and similarity to Eurorack intact for ease of use and seamless integration into Eurorack systems if desired.


Price shown is for the System B set of modules.

Main Features include:

  • Practically no limit to the number of modules and rack rows that can be added.
  • The System B currently comes with 45 modules (plus the two input/output free modules). Including 3 Oscillator modules, 5 filters, 2 Amplifiers, 2 Mixers, 1 panner, 1 ADSR, 1 VCLFO, 1 Random-Sample and Hold, 1 Noise module, 1 Delay module, 1 Chorus module, 1 Reverb module, 2 Ring Modulators, 1 CV sequencer, 1 Trigger sequencer and many more utilities like Input/Ouput modules, MIDI to CV, tempo from DAW, clock divider, logic Tool, switch and CV tools.
  • Can work as an effect with multiple inputs and outputs.
  • Both 14bit and 7bit MIDI is supported concurrently and automatically without preconfiguration.. (currently using LSB/MSB).
  • Polyphony is possible using manual patching as it is done in hardware. Or through the sequencer modules.
  • Multichannel MIDI support. Can be used to achieve multi-timbral voices.
  • MIDI patch points and MIDI cables routing between modules all working at audio rate.
  • Support for Bi-directional patch points that can work as both inputs or outputs at the same time. As in some Eurorack modules, like switches for example.
  • Offers a ridiculous amount of oversampling (up to X256). This is NOT a zero stuffing or interpolation method. This is an actual increase of the internal sampling rate inside the synth. Which means that it can process ultra sonic audio. I provide such features for people who are particular about quality, Not that any current CPU can handle it..
  • Audio rate modulation of any CV input. The system even allows ultra sonic modulation when oversampling.
  • Minimum internal sample block size (1 sample), this gives minimum possible delay between modules.
  • Engineered from ground up to be CPU efficient. With optimization done at each level or development, not just at the end.
  • Connectivity to modular hardware is supported (including but not limited to Eurorack). With 10 Audio/CV inputs, 12 Audio/CV outputs. (Note: For low frequency CV you will need an interface that has DC coupled inputs/outputs. Or use dedicated modules like the Expert Sleepers (TM) ES-6 and ES-3.
  • Currently 220 presets are available (PLUS extra variations).
  • More modules are expected to be added. Some of them may be included as part of the System B, others will be sold separately.

More information about the modules can be found in shop page.


NONE of the currently available SoloStuff modules are emulations of other hardware manufacturers modules. Please DO NOT assume that these are emulations.

Latest User Reviews

Average user rating of 4.00 from 2 reviews

Reviewed By J1000
October 10th, 2021

I've just tested v2.0 of this modular synth I didn't know about. I was surprised by the amount of modules it has and their diversity. The sound quality was very good judging by the presets. It looked promising, but when tried to build my own patch, which should be the most fun part, I struck a wall of unfriendly interface. Skeuomorphic graphics should be a thing a past (actually a long time ago) because they burden the sight of user with unecessary graphics. And what's the point of having software that looks exactly like hardware?! When you want to find a knob, module or I/O socket, you're constantly scanning across the sea of same gray circles, nut and bolts, redudant text, just to find/read what you're looking for. Also, when you want to add a new module the menu is located in the top-left part of GUI, not the most friendly location for constant mouse clicking. Every module looks similar, there is no color coding which would be highly useful on top bar of each module, so you can instantly know by the color what's the actual module. The silly background image, rack rails and solostuff logo on each module doesn't help the clutter either. But, that is easily fixable if the developer improves the workflow and makes it fun to experiment with all the modules provided. Until then it's mainly for the people who like to have (another) modular synth in their collection.

Response from S0lo from SoloStuff on October 19th, 2021

Thanks. But I'm afraid you'll be lost then if you try real modular hardware. The whole point of the Skeuomorphism here is to familiarize people with Eurorack hardware. There is a scheme and whole atmosphere there that can be a steep learning curve, so we try to teach you that cheaply before you decide to take the plunge into hardware. Otherwise, we could have just put menus, and plain circles and squares that any school kid can draw and call it a synth. Just have a look at some thing like "Make Noise" or "Doepfer" modules. See if you can figure out the UI there in 10 minutes of so.

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Reviewed By kokotte
April 2nd, 2018

Superb modular with a lot of great modules made by a dev who know his stuff, coding & modular hardware.

the CPU footprint is light and the in.out module work like a charm with other cv synth or external world.

i could put a 5 stars if the ui become resizable.

on a 4k screen, it can be little.

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