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Open freeware downloads Open products & archive Contact us

Legacy VST instruments from the early days•Status: November 7, 2026 at 12:36:49 CET

INTERACTIVE · WEB AUDIO Open standalone demo

Play the keys, change the filter and adjust the sound. This is a browser demonstration, not a download of the archived VST plugins.

Freeware · V1.1.0

RealSynth.NET VST3 for Windows.

Our new downloadable instrument plugin is available free of charge. Explore its attack, filter, resonance and release controls, preview the interface and install it in a compatible VST3 host.

Free downloadWindows 64-bit · VST3

Explore free VST3 instrument

RealSynth.NET freeware VST3 plugin screenshot with waveform, four controls and piano keys

↓ Download ZIP · Free

Freeware · Kombinuid V1.2.0

Kombinuid — five classics, one instrument.

Kombinuid brings together the five classic RealSynth.NET instruments from our archive: OctaVirus, Phazuid V3, Phazuid V4, Pianguid and Synthdruid. Their original individual releases were developed around 20 years ago and have since been officially discontinued and removed from our active product lineup.

Now united within a modern, free Windows VST3 hybrid instrument, their legacy lives on alongside six oscillator sections, mixer controls, filter shaping, modulation, envelopes, effects and a piano layer. The original plugins remain available to view in our archive only; they are no longer distributed or supported separately.

Freeware · €0VST3 instrumentWindows x64

Explore Kombinuid freeware →

Preview of the Kombinuid VST3 hybrid synthesizer interface

↓ Download Kombinuid ZIP · FreeRead the full description, installation guide and download details under Freeware.

Freeware · Sidechanger V1.4.6

Meet Sidechanger.

Sidechanger is now available as a free Windows VST3 audio effect. Shape detector response and ducking, create tempo-driven pumping, add LFO movement and watch the 60-second introduction video.

Freeware · €0VST3 audio effectWindows x64

Explore Sidechanger freeware →

Preview of the Sidechanger VST3 audio effect interface

↓ Download Sidechanger ZIP · FreeWatch the product introduction and find installation help under Freeware.

Freeware collection

Three free VST3 downloads.

RealSynth.NET currently offers three freeware plugins on one page: the RealSynth.NET instrument, the Kombinuid hybrid synthesizer and the Sidechanger audio effect.

Each freeware release includes its own description, screenshot, direct ZIP download and independent download counter. Future freeware plugins can be added to the same structure later.

Open freeware collection →

“All free releases now live together under Products & Archive → Freeware.”

3 freeware pluginsSeparate download countersWindows VST3

Our story

Two decades later, the archive returns.

About 20 years ago, RealSynth.NET developed the original OctaVirus, Phazuid V3, Phazuid V4, Pianguid and Synthdruid instrument plugins. These original standalone products have been officially discontinued and removed from our active catalog. Their images are preserved in the Legacy Archive for historical reference only.

We are also developing new creative tools. RealSynth.NET VST3, Sidechanger and Kombinuid are now downloadable as freeware, while possible paid releases remain future ideas.

“Legacy instruments can be revisited as archive pieces, while new ideas continue to grow.”

RealSynth.NET · archive, history and future direction

Important notice

Archived plugins, no active support.

The original instrument plugins were programmed around 20 years ago and have been officially discontinued. They remain in the archive as historical screenshots, with no separate downloads, updates or technical support. Their designs have been brought together in the current Kombinuid freeware instrument. Please use the contact form for general enquiries, not legacy-plugin technical support.

Legacy archive

Classic instrument plugin interfaces are displayed again to document RealSynth.NET’s earlier work.

No support anymore

These archived plugins are no longer supported. No technical support, maintenance or compatibility assistance is offered for them.

Future possibilities

Three current free plugins are available: the RealSynth.NET instrument, the Sidechanger audio effect and the Kombinuid hybrid synthesizer. Future product ideas remain under consideration.

Quick search available

You can search for plugin names such as OctaVirus, Phazuid, Pianguid or Synthdruid using the search field in the header or directly on the Products & Archive page.