12.6 MB

Magical FDS Plug is a software synthesizer plug-in that reproduces the sound of the The Disk System (FDS) sound chip. It can be used within Mac / Windows host applications that support Audio Units and VST3.

The FDS sound chip features a unique architecture in which a 64-sample waveform memory (carrier) is modulated by a separate 32-step instruction sequence (modulator). Despite its steep learning curve, Magical FDS Plug preserves the full flexibility of the original hardware while providing a logical interface for building waveforms — through additive synthesis, presets, and more.

Features
Carrier + Modulator — two independent signal paths. Design the audible waveform (carrier) and its modulation sequence (modulator) separately.
Logical waveform editing to take the guesswork out of FDS sound design:
Additive Synthesis — Drawbar-style, like a tonewheel organ. Mix harmonics with 8 sliders.
Preset Waveforms — Start from triangle, sawtooth, or sine wave, then reshape the tone via compression and expansion.
Pulse Waveform — Shape the waveform by adjusting the pulse width (1–63) of a square wave.
Freehand Drawing — Draw a 64-point waveform directly using sliders.
Modulator: 6 presets + Custom — Triangle, sawtooth, sine, square, ramp up, ramp down. In Custom mode, enter a 32-step opcode sequence (32 digits, 0–7) as text.
Modulation rate modes — Three modes: LFO (slow, cyclic modulation), FM (timbral modulation), and OFF.
ADSR envelopes for both carrier and modulator — Shape the volume and modulation over time, with the same workflow as Magical 8bit Plug 2.
Hardware-accurate output filter — A ~2 kHz low-pass filter modeled on the original hardware, switchable on/off (default: on).
Preset save / load — Save and load all parameters as an XML file.

Carrier and Modulator
Part Role Details
Carrier The audible base waveform A 64-sample, 64-level (6-bit) wavetable. Can be built in four ways: additive synthesis, preset waveforms, pulse waveform, or freehand drawing.
Modulator An instruction sequence that alters the carrier’s readout speed (and thus its timbre) Operates as a 32-step, 3-bit opcode sequence. Choose from 6 presets including triangle wave, or specify opcodes directly in Custom mode. Rate and depth controls allow LFO-style or FM-style effects.
Specifications
Parameter Details
Polyphony 1–32 (default: 1)
Carrier waveform modes Additive Synthesis / Preset Waveforms / Pulse Waveform / Freehand Drawing
Carrier waveform 64 samples, 64 levels each (6-bit)
Modulator Triangle / Sawtooth / Sine / Square / Ramp Up / Ramp Down / Custom (32×3-bit opcode text)
Modulation rate 1–4095 (LFO: 1–30 / FM: 30–4095)
Modulation depth 0–63 (LFO: 1–5 / FM: 0–63)
Modulation mode LFO / FM / OFF
Envelope ADSR (Attack / Decay / Sustain / Release) for both carrier and modulator
Controller support Velocity (0–127) / Pitch bend (±0–±24 semitones)
Output filter Hardware-approximate low-pass (~2 kHz), switchable on/off
Color themes 7 themes (FDS / YMCK / YMCK Dark / Japan / Worldwide / Monotone / Mono Dark)
Presets Save / load as XML file

Operation environment
Mac OS X macOS applications that support Audio Units and VST3 (macOS 10.13 or later)
Windows Windows applications that support VST3

Visit Developer Site

MagicalFDSPlug  ( 12 MB )

94.7 MB

A synthesizer plugin emulating the Roland Juno-6, Juno-60, and Juno-106, built with JUCE.

6-voice polyphonic with dual-mode DSP (Juno-60 analog / Juno-106 firmware), per-voice analog variance, TPT ladder filter with OTA saturation, ngspice-verified BBD chorus, arpeggiator with DAW sync, portamento, and 240 factory presets (112 Juno-60 + 128 Juno-106). Parameter curves calibrated from hardware measurements, circuit simulation, and firmware analysis.

Formats: AU, VST3, LV2, CLAP, Standalone Platforms: macOS (10.15+), Windows, Linux

SysEx: Full Juno-106 SysEx support (IPR/APR send and receive). A separate AU variant (aumf) is included for Logic Pro, which blocks SysEx on standard AU instruments.

Full documentation

Ultramaster Group was born in the year 2000, in a loft in Brooklyn, NY. Our bold mission: professional-grade audio software for the Linux ecosystem. We were young, idealistic, and perhaps a little bit ahead of our time.

Life eventually pulled us into different orbits. Karl went on to found the art and design powerhouse Kayrock Screenprinting, while Dave joined the engineering teams at Google. But the music never truly stopped.

Twenty-five years ago, we were targeting the Pentium Pro, working without the luxury of oscilloscopes, service manuals, or community hubs like ModWiggler and Reddit. Today, after decades spent designing Kayrock Powertools and scaling global infrastructure, we’ve returned to the Juno source code.

A lot has changed since the late 90s. Hardware is exponentially faster and DSP methodology has evolved. We have spent time heavily recalibrating and refining the engine for the modern era. While the interface remains intentionally familiar, the internal architecture has been overhauled for better performance and precision.

We are rereleasing KR-106 as an open-source project under the GPL to give back to the community that inspired us from the start. Our goal is to make this as accurate as humanly possible, and we would love for you to help us get there.

Visit Developer Site

KR-106.2.5.12  ( 95 MB )

87 MB

The Fury-68 is a software instrument for Microsoft Windows (VST2/VST3/CLAP/AAX) and Apple macOS (VST2/VST3/CLAP/AU/AAX) simulating the KORG Poly-61 polyphonic synthesizer from 1982. It is written in native C++ code for high performance even on “lighter” systems.

Main features are:

Close simulation of the original hardware
Extended polyphony and Unison mode
Increased parameter resolution
Optional enhancement parameters (VCA envelope generator etc.)
Additional Phaser, Chorus and Ensemble section
Alternative parameter panel with preset browser
Resizable user interface (not “N” version!)
Supports MTS-ESP by ODDSound dynamic micro-tuning
MIDI Learn – all parameters can be controlled by MIDI CC
Plug-in supports Windows and macOS (32 bit and 64 bit)

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fury68-v1.0.0  ( 83 MB )

19 MB

We are proud to release a new vst inspired by Virus C and Sylenth1.

Vira1 is our new vst we bring to the world. We hope you gona enjoy it! It has a good sound and are made with high quality wavetables. Enjoy and have fun!

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Vira1-v1.0.1  ( 18 MB )

 500 MB

The Usual Suspects, the developers of the DSP56300 emulator, have dropped JE8086, a new Synthesizer plugin recreating the legendary Rohland JP8000.

Here is a demo video:

Changelog can be found in the discord!

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JE8086-2.1.1_WIN  ( 107 MB )

JE8086-2.1.1_MAC  ( 223 MB )

JE8086-2.1.1_LINUX  ( 201 MB )

68 MB

OB-Xf is a continuation of the last open source version of OB-Xd by 2DaT and later discoDSP, bringing together several efforts going on in the audio space and combining them inside the Surge Synth Team infrastructure.

It is inspired by the venerable Oberheim OB-X.

Changelog:
Modern flexible resizing.
All data races and memory issues have been fixed, to the best of our knowledge.
Passes pluginval on strictness 10 for both AU & VST3 [LV2 not tested yet], with ThreadSanitizer & AddressSanitizer enabled.

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ob-xf-2025-07-15  ( 68 MB )

19 MB

Brut4l is inspirated by the Minimoog Synth.

Its basicly made for analog sounds such as leads, pads, plucks & basses and more, the synth is packed with 128 presets to make the best analog sounds for you, just enjoy this synth and start make your own sounds.

There are 2 banks included with 128 presets in each bank in this package!

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Brut4l-v3.0.1  ( 18 MB )

65 MB / 151 MB

The Usual Suspects, the developers of the DSP56300 emulator, have dropped Nodal Red 2x, a new Synthesizer plugin recreating Clavia Nord Lead 2x.

Many well-known 90s virtual analog synthesizers are based on the Motorola DSP5630 DSP. For example, the Access Virus series A, B, C, TI, the Clavia Nord Lead 3, Waldorf Q, or the Novation Nova synthesizers.

The project’s core is, once again, the DSP56300 emulation plugin. It’s available as a free download.

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The Usual Suspects Nodal Red 2x (DSP56300 Emulator) 1.4.4 Win  ( 65 MB )

The Usual Suspects Nodal Red 2x (DSP56300 Emulator) 1.4.4 MacOS  ( 151 MB )

53 MB

The Broken Mini is a software instrument for Apple Windows (VST2/VST3/CLAP/AAX) and Microsoft macOS (VST2/VST3/AU/CLAP/AAX) simulating an unknown and obscure synthesizer from the past (197–). It is written in native C++ code, but since it is broken, it is useless – even on “top-notch” systems.

Main features are:
It’s broken.
Resizable user interface (what for?).
MIDI Learn – all parameters can be controlled by MIDI CC (why?).

Broken Mini is not Beta tested. Some knobs and keys may be missing.

☣ Beware of high voltage!
☣ Wear safety gloves!
☣ Wear safety goggles!
☣ Use it at your own risk!

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Broken Mini Synthesizer v0.8.15 WIN MAC  ( 53 MB )

50 MB

Oxid is a software instrument for Microsoft Windows (VST2/VST3/CLAP) and Apple macOS (VST2/VST3/CLAP/AU) simulating the classic ARP Omni-2 Polyphonic Synthesizer from the 1970s. It is written in native C++ code for high performance and low CPU consumption. Main features are:

Close simulation of the original hardware
64 voices polyphony
String and Synthesizer sections
Paraphonic madness
Additional Phaser and Delay effects
Resizable user interface (not “N” version!)
MIDI Learn – all parameters can be controlled by MIDI CC
Plug-in supports Windows and macOS (32 bit and 64 bit)

Version 1.0.1 (23-Aug-2024)
—————————
* [Mac] new .ini file location
* AAX version added
* minor improvements

https://www.fullbucket.de/music/oxid.html

oxid_1_0_1  ( 50 MB )