SHRUB VST3 Is a Free Mini-Serum Plugin
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Xfer Records has released SHRUB VST3, a free mini-Serum plugin for macOS, Windows and Linux. It brings selected Serum oscillators, filters, modulation and effects into a smaller four-note synth that runs inside your DAW. Here is what the free plugin includes, which Serum presets it opens and where its limits begin.
Table of contents
What does SHRUB VST3 include?
SHRUB VST3 uses the same synth engine and presets as Xfer Records’ SHRUB firmware for the M-VAVE FM-1. It gives you two wavetable oscillators, a sub oscillator and a noise source. The 64 built-in wavetables come from Serum 1, Serum 2 and factory-preset content.
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Each main oscillator has up to eight unison voices, along with familiar Serum warp modes such as sync, bend, PWM, mirror, FM, AM and ring modulation. You can also import user wavetables with as many as 64 frames. If wavetable position and frames are still new territory, our explanation of how wavetable synthesis works covers the basics.
Modulation comes from three envelopes, four LFOs, two chaos generators, four macros and a 16-slot modulation matrix. The effects rack holds seven modules selected from ten Serum 1 effects, including distortion, chorus, delay, compressor and reverb. This is a small free synth, but it gives you enough tools to build a patch without immediately reaching for another plugin.
Where does the free SHRUB plugin fall short?
SHRUB can play up to four notes at once, with oscillator unison drawn from a 16-voice pool. Heavy unison settings can reduce the available note count, although the engine always keeps at least one note playing. That ceiling suits basses, leads and plucks better than large pad chords.
All sounding notes also pass through one shared filter. SHRUB includes 76 filter types, but a chord does not receive separate cutoff and envelope movement for each note as it would in full Serum 2. New notes can therefore change the filter response of notes you are already holding.
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Xfer also says the plugin is not especially CPU-efficient because it runs the device code used by the FM-1 firmware. The current release is marked beta, so it makes sense to save important patches and keep project copies. A free plugin is still allowed to make the CPU fan join the arrangement, but this one gives you fair warning.
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Can SHRUB VST3 open Serum presets?
SHRUB can import Serum 1 .fxp presets, including their oscillators, wavetables, warps, filters, envelopes, modulation and the first seven effects. The editor reports settings it could not translate instead of silently ignoring the differences. You do not need Serum 1 installed because SHRUB can download requested factory presets from shrub.audio and cache them locally.
Serum 2 presets do not work in SHRUB. The plugin can export its own patches to Serum 2, but its arp, scale, voice settings and per-note random controls do not transfer. Chords may also sound different because Serum 2 gives each voice its own filter.
The local SHRUB library contains 128 slots, with factory sounds in slots 1 to 100 and INIT patches in the remaining slots. Your DAW saves the current sound, wavetables, library and MIDI map with the project. Every exposed plugin parameter can also be automated by the host.
How do you install SHRUB VST3?
Installation is manual: unzip the download, copy Shrub.vst3 into your normal VST3 folder and rescan plugins in your DAW. Xfer supplies a Universal macOS build, a Windows x64 build and separate Linux arm64 and amd64 packages. The maker has not listed minimum operating-system versions or tested DAWs.
SHRUB is available only as VST3. There is no AU, AAX, VST2, CLAP or standalone version listed. If your DAW cannot load VST3 instruments, you can still play SHRUB through its browser editor.
The official SHRUB operation guide covers the folder locations and manual installation. The VST3 does not include the browser version’s motion-sequencer editor and cannot connect to or update an FM-1.
macOS: /Library/Audio/Plug-Ins/VST3
Windows: C:\Program Files\Common Files\VST3
Linux: ~/.vst3
Price and availability
SHRUB VST3 version 1.00 is available free from Xfer Records for macOS, Windows and Linux. It is worth downloading if you want a compact wavetable synth with familiar Serum tools and can work within four-note polyphony and one shared filter.
The plugin is a useful free instrument rather than a replacement for the full Serum 2. You can download it from the official SHRUB page or try the browser editor before installing anything.
Download SHRUB VST3 Free
Version 1.00 is available from the official SHRUB page. Choose the macOS, Windows or Linux package and copy the plugin into your VST3 folder.
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Frequently Asked Questions
Is SHRUB VST3 completely free?
Yes. Xfer Records offers SHRUB VST3 as a free download for macOS, Windows and Linux. No paid license or license manager is listed.
Can SHRUB load Serum 2 presets?
No. SHRUB can import Serum 1 .fxp presets, but it cannot open Serum 2 presets. It can export its own patches for use in Serum 2, with some settings left out.
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