Surge XT 1.0.0 Windows/MacOS/LiNUX [FREE] 0 (0)


Over 2021, after the succesful release of Surge 1.9, the Surge Synth team undertook an effort to rebuild Surge in JUCE and add a variety of features. This project resulted in the new version of Surge, called ‘Surge XT’.
Synthesis method: Subtractive hybrid

Each patch contain two scenes which are separate instances of the entire synthesis engine (except effects) that can be used to create layered or split patches.

Quick category-based patch browser with textual search and favorites

Runs on a variety of operating systems, plugin formats, and architectures

2779 patches

614 wavetables

3 oscillators per scene, with 12 versatile oscillator algorithms: Classic, Modern, Wavetable, Window, Sine, FM2, FM3, String, Twist, Alias, S&H Noise and Audio Input.

Classic oscillator is a morphable pulse/saw/dual saw oscillator with a sub-oscillator and hard sync.

Modern oscillator is a mixable saw/pulse/triangle oscillator with an optional sub-oscillator mode for triangle (which can also change to sine or square) and hard sync.

FM2/FM3 oscillators consist of a carrier and 2 or 3 modulators and various options.

String oscillator uses two filtered waveguides to emulate plucked or bowed string sounds.

Twist oscillator is based on a very famous Eurorack macro oscillator, and it offers a myriad of synthesis options in a very simple and quick way.

Most algorithms (except FM2, FM3, Twist and Audio Input) offer up to 16-voice unison at the oscillator level.

Oscillator FM in 3 different configurations and ring modulation between oscillators 1-2 and 2-3.

Most oscillator algorithms (except FM2, FM3, Sine and Alias) are strictly band-limited, yet still cover the entire audible spectrum, delivering a clear, punchy and clean sound.

Noise generator with variable spectrum (available directly in the oscillator mixer).

Two filter units in 8 different configurations.

Feedback loop available in 7 of those configurations.

Available filter algorithms: Lowpass (12 and 24 dB/oct, each with 3 variations), Legacy Ladder Lowpass (6-24 dB/oct), Vintage Ladder Lowpass (2 variations, each with and without gain compensation), Highpass (12 and 24 dB/oct, each with 3 variations), Bandpass (12 and 24 dB/oct, each with 3 variations), Notch (12 and 24 dB/oct, each with 2 variations), Allpass (3 variations), Comb (positive and negative), S&H.

Open-source additions to our filter algorithms include: K35 and Diode Ladder filter types from Odin 2 synthesizer, 12 and 24 dB/oct multimode filters from OB-Xd, and weird but fascinating Cutoff Warp, Resonance Warp and Tri-Pole filters by Jatin Chowdhury!

Filters can self-oscillate (with excitation) and respond amazingly fast to cutoff frequency changes.

Waveshaper (43 shapes).

12 LFO units available, 6 are per voice and 6 are global for the whole scene.

DAHDSR envelope generators on every LFO.

LFO shapes consist of 7 deformable LFO waveforms, step sequencer, a fully-fledged multi-segment envelope generator (MSEG) with various curves and up to 128 nodes, and last but not the least – a formula modulator which utilizes Lua scripting language to provide completely custom modulator output.

Voice LFOs allow envelope retriggering in step sequencer mode.

Extremely fast and flexible modulation routing. Almost every continuous parameter can be modulated!

16 effect units arranged as 4 inserts per scene, 4 sends and 4 master effects.

27 effect algorithms:

3-band fully parametric EQ
11-band graphic EQ

Tape (based on ChowTapeModel!)

Frequency Shifter
Ring Modulator

Rotary Speaker

Reverb 1
Reverb 2
Spring Reverb

Airwindows (itself containing 56 effects!)
Mid-Side Tool


2RuleSynth by 2Rule 0 (0)


2RuleSynth is a hybrid synthesizer featuring classic subtractive, FM or and Ring simulatenously.

It has LFOs and ADSR for every two independent oscillators. It has its own characteristic soundscape that can go as far as concrete music. Besides the familiar classical analog sounds, experimental sounds can be found using the randomize button.

  • 2 Independent Oscillators.
  • Waveforms: Sine, Saw, Triangle, Square, White Noise.
  • Controls: Waveform, Volume, Fine-Tune, Octave.
  • Each Oscillators has its own filter, amp and filter ADSR and LFOs.
  • ADSR Controls: Depth, Attack, Decay, Sustain, Release.
  • LFOs for amp, filter and pitch syncable to tempo.
  • Ring algorithm Osc1 x Osc2.
  • FM modulator Oscillator 1 modulates Oscillator 2.
  • Self resonance Moog type filter Low Pass, High Pass, Band Pass for each oscillator.
  • Mono/Polyphonic control.
  • Spectrum and Wave Windows.
  • Reverb.
  • Delay syncable to tempo.
  • Chorus.
  • Waveshape distortion.
  • 8 note polyphonic operation.
  • Preset randomize button.
  • 49 factory presets.
  • VSTi3

Caustic 3 by Single Cell Software 5 (1)


Caustic 3 is a music creation tool inspired by rack-mount synthesizers / samplers rigs.
Everything is real-time and optimized for mobile devices.

Create your rack by adding up to 14 machines from a choice of:
Subsynth – Virtual analog subtractive synthesizer
PCMSynth – Multi-sample wave synthesizer
BassLine – 303-like monosynth
BeatBox – 8-channel sampling drum machine
PadSynth – Harmonic table pad synthesizer
8BitSynth – 8bit equation solver synthesizer
Modular – Fully configurable and routable synthesizer
Organ – Hammond-like tonewheel organ with rotary speaker
Vocoder – 8-band harmonic vocoder
FMSynth – DX-style 3-operator fm synthesizer
KSSynth – Karplus-Strong string modeling synth
SawSynth – Supersaw-type polysynth

The app also includes:
* Effects rack supporting 2 effects per machine. (20 effect types)
* Mixer desk with global Delay/Reverb effects
* Master section with parametric EQ and limiter
* Song sequencer

Supports automation on most controls and includes powerful editors for modifying recorded automation curves.

All files are stored on the user-accessible storage, and users can supply their own WAV files for use in the PCMSynth, BeatBox, and Vocoder.
Supports all uncompressed WAV files (8-16-24-32bit, any sampling rate).
The PCMSynth can also load SoundFont files (.sf2) and FL Studio mobile instruments (.instr, .ZIP)
Class-compliant USB MIDI controllers can be connected via USB OTG cable on devices running at least Android 3.2 and supporting USB host mode.

See the in-app help section for tutorial videos and full online manual.




Onsen Audio OS-251 v1.0.1 VST3 AU WiN MAC LiNUX [FREE] 0 (0)


OS-251 is a pure digital lo-fi synthesizer plugin for Mac, Windows and Linux
OS-251 is a “JUNO” style digital subtractive synthesizer with a simple yet powerful DSP algorithm. Unlike other plugins that use analogue simulation, OS-251 uses digital algorithms to give warm, lo-fi sounds. The design of the oscillators and the selection of parameters were influenced by the JUNO-106, making it easier to express a thicker, chunkier sound.

The oscillator has alias noise (specific to digital signal processing) famous on classic samplers like E-mu SP-12 which adds lo-fi feeling to the sound. You can enjoy the powerful sound at modern sampling rates with your DAW.

Easy to use
Tired of overwhelming synthesizers with hundreds of parameters and presets? Then OS-251 is for you! OS-251 is equipped with only carefully selected parameters, allowing musicians to concentrate on music production. You can see every parameter at once, so you can have a stress-free experience. Because the number of the parameters is limited, you can create the desired sounds yourself quickly and you don’t have to spend your precious time choosing presets.

Key features
• Up to 10 voices of polyphony
• Oscillators (Sin, Square, Saw), with Shape parameter
• Square sub oscillator
• Noise oscillator
• Biquad low-pass filter (LPF) with Frequency and Resonance parameters
• Biquad high-pass filter (HPF) with Frequency parameter
• Envelope generator which can control LPF and amplitude
• Low-frequency oscillator (LFO) which can control LPF, amplitude, and Shape parameter
• LFO sync
• Chorus
• Flexible pitch controls (pitch bend width, octave, semitone, fine tuning)


OS-251 by Onsen Audio 0 (0)


OS-251 is a pure digital lo-fi synthesizer plugin for Mac, Windows and Linux. Available in VST3 and AU plugin formats for free.

Digital lo-fi sounds

OS-251 is a “JUNO” style digital subtractive synthesizer with a simple yet powerful DSP algorithm. Unlike other plugins that use analogue simulation, OS-251 uses digital algorithms to give warm, lo-fi sounds. The design of the oscillators and the selection of parameters were influenced by the JUNO-106, making it easier to express a thicker, chunkier sound.

The oscillator has alias noise (specific to digital signal processing) famous on classic samplers like E-mu SP-12 which adds lo-fi feeling to the sound. You can enjoy the powerful sound at modern sampling rates with your DAW.

Easy to use

OS-251 is equipped with only carefully selected parameters, allowing musicians to concentrate on music production. You can see every parameter at once, so you can have a stress-free experience. Because the number of the parameters is limited, you can create the desired sounds yourself quickly and you don’t have to spend your precious time choosing presets.

Key features:

  • Up to 10 voices of polyphony.
  • Oscillators (Sin, Square, Saw), with Shape parameter.
  • Square sub oscillator.
  • Noise oscillator.
  • Biquad low-pass filter (LPF) with Frequency and Resonance parameters.
  • Biquad high-pass filter (HPF) with Frequency parameter.
  • Envelope generator which can control LPF and amplitude.
  • Low-frequency oscillator (LFO) which can control LPF, amplitude, and Shape parameter.
  • LFO sync.
  • Chorus.
  • Flexible pitch controls (pitch bend width, octave, semitone, fine tuning).

Fugue State Audio Shapeulator free plugin synth VSTI3 0 (0)



Shapeulator is essentially the product of a modular patching session, and a desire to have the core setup used available for further sound design fun. At the most basic level, it is a subtractive synthesizer, with some additional features that make it especially useful for certain types of pads, fx sounds, and synthetic percussion.

The main features that separate Shapeulator from other analog-style subtractive synths are the waveshaper oscillator and resonator. The waveshaper oscillator is a fairly standard VA osc with a waveshaper that is controlled by another oscillator. This second oscillator can be modulated independently, and creates a sound something like amplitude modulation. The resonator is a stereo bank of tuned delays with feedback, which can also be modulated.


WaveFolder by Martinheterjag 0 (0)


The Wave folder is inspired by west coast modular synths like Buchla and Serge, where you instead of starting with a harsh waveform (Eg. square or saw) and filter it like on a subtractive synth, you instead start with a sine wave or triangle and distort it to get a harsher sound. This VST is folding a waveform in similar ways as serge or buchla modules but is not supposed to emulate them. The wave folder VST will sound harsh and digital and can be used on smoother sounds to add texture or be used on more complex sound sources and open the gates to the realms of heavy distortion an

No Homepage


C-C- -01 by Christopher Carmichael – KVR Challenge 0 (0)


Quickly, I’ll tell you (so you don’t necessarily have to read the more detailed version with good technical stuff and known issues, below, but it should help you), the C-C- -01 is a Signal Enhancer. It can:

  • EQ/Filter (7-bands).
  • Peak Follow (with RMS, Oscillators, and Noise also, and also change the Oscillators’ sound response curve going into the Oscillators Peak Followers, and change both response curves for both Peak Followed signals), and change the signal’s Attack and Decay moderately.
  • Wet-Dry.
  • Blend RMS and the Peak Follower.
  • Blend Saturation and the previous EQd, Filtered, and Peak Followed Signal.
  • Subtract the EQ and Filtering from each previous signal at each EQ band, and/or subtract the entire EQ process from before Equalization, and use “Non-EQd Makeup” controls to boost back (and beyond), in parallel, the remaining signals after the EQd signal was subtracted.
  • Oversample.
  • Saturate.
  • Use dual-bands, can split Stereo signal into Mid/Side, all things can be manipulated per channel.
  • Use Linked Controls.

Also, sorry, but some of the things in the About DOC that comes with the plug-in are slightly inaccurate, some things I don’t describe properly. Most, if not all of the corrections are listed on this page.

I’m no coding or programming genius, I just use SynthEdit and connect the wires, and do some basic things. Now for the more technical, more in-depth version (below).

Key Features/Notes/Known Issues/Problems, and some things you can do with the C-C- -01:

  • I cannot fix DAW/Host compatibility issues, that might be a SynthEdit problem. Also, Automation Parameter names may not completely show inside of some DAW/Hosts.
  • All Parameter Automations have not been tested, some have, I did this only because all controls of themselves have been tested during the testing and development phase. I cannot fix Parameter Automation problems if they arise, unless there is a setting I’ve missed in the internal working of SynthEdit, maybe I can fix that. I’ve plugged in all of the SynthEdit signal wires properly, as far as I know.
  • Has Peak Following (with a 2nd Peak Follower using Oscillators and Noise), RMS (for both Peak Followers), EQ/Filters (with a added subtractive process that subtracts the EQ’d signal from it’s predecessor, and allows you to blend back in the remaining signal, plus add a boost of that signal, or just use the subtractors on the whole EQ process, and then use the LMeqs and RSeqs sliders to blend back that remaining signal from before the entire EQ process, or a combination of the two sets of blend-back sliders for creative effects. I call this process “Non-EQd Makeup” on the plug-in GUI, above those blend-back slider controls), and Saturation.
  • Peak Follower 1 (called Peak Follower in the plug-in) operates on the Main Input Signal, after EQ/Filters. Peak Follower2 also operates on the Main Input Signal, after EQ/Filters, using the Oscillators/Noise. Both Peak Followers modulate (I think that’s the term) the volume control of separate sets of VCAs, one after the other (the 1st Peak Follower’s VCAs to the 2nd one’s VCAs), for each Peak Following process.
  • Has Left/Right and Mid/Side Input Signal Selection.
  • Has linked controls (internally, not on screen, also the Oscillators section has no linked controls), as well as fully independent control of both signal halves throughout most of the plug-in. Use the Left/Mid set of controls when using linked controls.
  • Has volume response curve options for both halves of the signal (see additional notes below for more about this).
  • 7-band EQ: 6 bands of Biquad modules, band 7 is a Band Shelf Mid Range Boost/Cut. The EQ processing order is: EQ1 to EQ7, consecutively.
  • Wet/Dry mix for the entire FX process, as well as a Saturation blend and an RMS to Peak Follower blend per Peak Follower.
  • Has Oversampling up to 32x, and FIR type.
  • Has Channel On/Offs to isolate your signal.
  • Use the Input Trim and Drive Controls to find the sweet spot on each of the 3 Saturators, and make up gain lost or boosted using the Effects Makeup Gain, so you can compare the before and after of the whole FX process. Drive your Sides signal into Saturator 1 at 30% Wet while pushing the Mids into Saturator 3 at 70% Wet for smoother, more subtle distortion/saturation sounds (Hypothetically speaking. each Saturator is different, and may still have a harsher edge to it, also depending on your setting, but this process helps to smooth that out a bit).
  • (Also hypothetical, depending on your sound’s frequency range) Use a Notch Filter to cut an area, then boost back its’ remaining predecessor signal to get rid of some of those “nasal-y” artifacts, careful though, too much can almost ruin your sound. I think some phase shifting can occur, but I have not examined that. Creative effects can be found by randomly moving and setting the Non-EQd Makeup sliders before/while EQing. In one instance, I tried cutting a large amount (-60 db) using a Peak EQ Type with an average to moderate Q setting (I think the Q was somewhere in the range of .2 to 10), then boosting the Non-EQd Makeup in moderate to large amounts, and the effect was good.
  • Be careful when using the Oscillator Monitor Function, the volume may be intensely loud. Be sure to set your volumes low before you turn on the Oscillator Monitor. It is there to let you set a balance, if you want, but you can really push the volume into the Peak Followers if you want, but you probably don’t want to monitor that louder sound, it’s very distorted, and Oscillator waves at low, mid-range, and high frequencies might damage your ears (maybe all of them can actually, I actually don’t know, and I’m no expert). The real effect was designed for the Peak Follower, so no Oscillator sounds are actually heard when using it for it’s intended purpose, but you can hear the effect on the audio, it subtly equalizes and can boost clarity in your signal. Try a Sine at 1500 Hz on one channel and some Pink Noise on the other and you will hear for yourself. Try the Decay at max (about 5 o’clock) for more body. At the shortest Attack and Decay settings, transients can be more audible with a greater clarity of energy, but not drastically, depending on the setting. At the longest settings, smoother, bigger sounds are achieved. Add RMS and change the Rate Control to hear the difference, and blend between the Peak Follower before the RMS using the RMS Blend control for a natural balance. It is subtle. Use White Noise and Pink Noise together in a Mid/Side configuration to have the Peak Follower put Pink Noise on just the Sides signal, and White Noise on the Mids, and you can balance the volume going into the Peak Follower (it is just subtle to hear it), but when using Oscillator waves (Sine, Saw, etc.) near or at the same frequency and volume (in Mid/Side mode) you may notice more of a Left or Right balance to your signal, I believe since the Oscillators are Mono, not Stereo. I included one Oscillator for each signal half. So, Oscillator wave types and/or frequencies far enough away from each other should give a Mid/Side signal a chance of being encoded/decoded by the process, which means for more fun in your Peak Following. The White and Pink Noise seems to always work in Stereo or Mid/Side, though.
  • The Peak Meters may be slightly inaccurate, they show the level below clipping, while it may be that the signal is just clipping a bit. Sorry. As far as I’ve seen it’s only on very quick, loud peaks that it won’t show, otherwise it seems fairly accurate (compared to my DAWs meters, it is just a little below), but I’m no expert. I’m not quite sure how to fix this.
  • The Main Panel’s bottom left features a set of VCA Response Curve choices (I forgot to label them, sorry, you’ll see the words, Decibel when you load the plug-in), they apply only to the Main Signal’s 1st Peak Follower (called Peak Follower on the plug-in GUI, it’s the one that doesn’t use Oscillators). All of the Standard Volume knobs throughout the plug-in have the VCA Response set to the Decibel Curve. I couldn’t decide if I should change that, and I also didn’t have room to give another set of options for you to choose that. I think it’s best if you all can choose it, so I plan to add it later, in a newer version someday, with more Oscillators also.
  • Currently, there’s no internal preset browser. I have not tested whether the Save as .VSTPRESET option in a DAW/Host works. I believe it should. I have experienced issues, in a plug-in created using an older version of SynthEdit, where a saved DAW/Host version of a .VSTPRESET would not be recalled in a project, for some reason, I do not know the reason why though. I don’t know if that issue is present here, or if it’s even a SynthEdit problem at all, it could be that my DAW/Host version is older.

Made with SynthEdit, using only available modules and settings, not coded by myself at all.—01-by-christopher-carmichael

NUSofting Sinnah v1.2.1 free plugin synth 5 (1)

Sinnah is a freeware VA synth plugin (*and a project) but instead of the standard subtractive resonant filter it uses a resonant delay network.

Sinnah was updated to v1.2.1, here’s what’s new:

– ODDSOUND MTS-ESP supported microtuning to load ‘scala’ and .tun.
– files.
– Compatibility update for macOS Big Sur and Windows 10 latest.
– Reached 225 factory presets.
– GUI adjustments.



200 Factory Wavetables

200 original factory wavetables within the wavetable oscillator types, and another 100 original wavetables within the LFOs. Defiant WT also has the ability to Manually add new custom Wavetables

A Versatile Synth

Defiant’s Main Oscillator comes packed with different Synthesis styles, you can chose between Analog OSC, Digital (Wavetable) OSC and Additive OSC

Clean, Compact and Intuitive

A Clean and powerful sound – Defiant WT comes packed with +120 Factory Presets

A fully resize-able clean Interface with a small CPU Footprint