18 MB

A morphing multistage filter with chaotic colors
Heavy, gritty, banded, formed under pressure. A morphing multi-stage filter with colorful chaos. Two pre-filters into a saturating, pressurizing ladder — unpredictable and full of happy accidents. Made for drums, deep bass and textural noise, but it’ll morph into pads just as easily, or high-end analog-style sizzle in HP mode. Equal parts FX, instrument and sound-design tool.

morph pad – blend between whole-patch snapshots on an XY field; freely place points and glide between them live (XY is MIDI-mappable).
break / chaos engine – wavefolding, bitcrushing, clicks and more folded into the ladder – a playable nonlinear system.
high-quality ZDF transistor ladder + resonant SVF pre-filters, both stereo-detunable.
input-gated damping for transient sculpting and taming self-oscillation.
controls are MIDI-learnable (absolute and relative/modulation modes).
filter cutoffs playable by MIDI notes — per-stage channel selectors, glide, note-relative shifts.
coherent patch randomization and mutation.
custom UI builder — arrange your own control layout.
up to 8× oversampling.
lots of presets (try stacking two instances at ~0.5 mix each).

System requirements: Windows 10+, macOS 13.5+

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Gneiss.1.0.4  ( 18 MB )

16.4 MB

Dual-Filter Motion Lab. Toxic is a free dual-filter effect built for the KVR Developer Challenge 2026. It combines serial/parallel routing, three drive stages, analog and digital filter models inspired by the topology of a hardware VA synthesizer, LFOs, an envelope follower, and macro control in one performance-ready plug-in.

Filter concept
Toxic’s filter section is inspired by the topology of a legendary hardware VA synthesizer: a flexible dual-filter structure with serial/parallel routing, multiple analog-style and digital-style filter characters, and formant/vowel movement designed for animated sound design.

It is not a clone or an official emulation. The goal is to capture the workflow idea of a performance-oriented dual-filter synthesizer architecture and rebuild it as a free creative effect for modern DAW use.

Key Features
– Dual Filter Architecture — Filter 1 and Filter 2 can work in serial or parallel routing.
– Analog / Digital Filter Selection — Each filter can switch between analog-style and digital-style filter families.
– Multiple Filter Types — LPF, HPF, BPF, Notch, Peak, All-Pass, Comb, Buzz, Formant, and other character models.
– Three Drive Stages — Input Drive, mid-stage Drive 2, and Output Drive let you shape density before, between, and after the filters.
– Drive Character Choices — Tube saturation, diode clipping, germanium clipping, foldback, tape-style saturation, crunch, soft/hard clipping, bit crush, and decimation.
– LFO 1 / LFO 2 — Free-running or host-synced modulation with sine, triangle, saw, square, pulse, S&H, Perlin, stepped, damped, chirp, bounce, and ring-style motion.
– Envelope Follower — Drive the filter from the input signal with Attack, Hold, Decay, Release, Threshold, Scale, Amount, and Invert controls.
– Macro 1 / 2 / 3 — Assign multiple parameters to one performance control, including positive and negative modulation amounts.
– Expert / Perform UI — Use Expert mode for detailed patch design, then switch to Perform mode for large, direct controls on stage or during automation passes.
– Modulation Arc Display — Visual feedback around controls shows assignment amount and modulation movement.

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Toxic.1.0.2  ( 16 MB )

45.1 MB

Akai S900 filter plugin. Series 9000 includes the same sixth-order (steep!) low-pass filter made famous by a late 80s rackmount sampler. For fun, we threw in drive, resonance, and an envelope follower. Then we made it available as a completely free plug-in! Watch your fingers, this one will cut away the spectrum like a samurai sword!

Features:
– Low-pass filter with a steep, sixth-order sound characteristic
– Drive control for subtle to extreme distortion
– Resonance (Q) control for filter emphasis
– Envelope follower for adaptive cutoff modulation
– Light or dark color scheme for user preference

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Series.9000.1.0.1  ( 45 MB )

17.7 MB

28 Premium Filter Models with Real-Time XY Morphing. Quad Morph Filter is built for real-time sound design instead of the more static tone shaping. It lets you morph between up to four different filter models using an XY pad, with equal-power blending and several alternate morphing curves.

Analog-style filters: Moog Ladder, TB-303 Diode, SEM, MS-20 Screaming, CS-80, Prophet CEM3320, Oberheim SSM 2040, and Roland Jupiter-inspired filters.
Experimental filters: Formant, Comb Filter, Wavefolder, FDN Reverb, Bode Frequency Shifter, Z-Plane 2D Morph, Phased Array, Modal Resonator, Waveguide Mesh, and several digital precision filter types.

Features:
– Morph between up to four different filter models using an XY pad with equal-power blending
– Includes 28 filter models ranging from analog-style to experimental options like Formant, Comb Filter, and Wavefolder
– Four morphing modes: Equal Power, Linear, Smoothstep, and Radial
– Modulation system with 19 LFO waveforms, Recording mode for custom XY movement, and tempo sync options

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Quad.Morph.Filter.1.0.0  ( 17 MB )

32.1 MB

A native resonator effect. The editor is a spectrum graph where each dot controls one steep bandpass resonator, up to 32 active filters.

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PolarityRes.0.1.3  ( 32 MB )

12.5 MB

ShallowGrave – Cascaded filter effect

Shallow Grave is a filter effect for Windows and Mac. It features 3 SV filters allowing you produced a wide range of sounds and textures.

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ShallowGrave.v1.0.WiN.MAC  ( 13 MB )

16 MB

Sinensis is 6 bandpass filters.
You interact with the relation between their gains and frequency. You can input MIDI to play the bands with notes. To route MIDI to Sinensis, you can find info on this website

tl;dr : Set the output of a MIDI track to the track where the plug-in lives.

Sinensis is a bunch of bandpass filters. Inspired by modular such as Tides and Just Friends, you modulate their relation instead of their absolute frequencies.
You set the root frequency (either by hand with a tune widget, or with the MIDI input).
You then set the ratio between each band frequence and the gain of each band following simple functions. I contrained myself to avoid knob, sliders, drop-down menus and numeric values. Using colors and their evolution to inform the user. The goal being to show the state of the system, not to visualize each of its parameters.
In contrast with this unusual method, I chose to make a very clear and structured UI, big fonctionality blocks. I haven’t had much feedback on this plug but I’d be curious to have some people to test it whitout explanation to inform my future conception of UI.

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Sinensis100  ( 16 MB )

41 MB

YS – Filters Easy_ Audio filtering plugin. The plugin has simple functions and is easy to configure. Four types of filter Low Pass, High Pass, Band Pass, Band Reject to choose from.

The resonance regulator can be selected step-by-step 4 fixed settings or smooth. The effect can also be used in parallel mixing with the source. “Flux” adds movement to the sound by slightly shifting the channel frequencies relative to each other. At the output, a peak limiter is triggered if the threshold is exceeded.

(Three folders knob-31-51-101 with pictures of different storyboards in case the user does not have enough video card resources, the fader and large knob may not be displayed. Replace the pictures with a smaller storyboard. By default, 101 for greater smoothness and accuracy of adjustment).

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YS – Filters Easy_ v.1,0  ( 41 MB )

13 MB

Free tape stop audio effect plugin
cStop is a tape stop audio effect plugin available for Mac and Windows in VST3, CLAP, and AU (Mac only) formats.

Tips on using
The only parameter you need to automate is called “Mode”
When using the tape START mode, the audio will be out of sync with real time until you go back to BYPASS

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cStop.v1.0.1  ( 13 MB )

12/14/32 MB

Two Filters, Two Step Sequencers, and some fixed mod paths.
Really, it’s a test bed for our new Filter API. But you may find it fun. Some people have!

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two-filters-Win-2025-11-18  ( 12 MB )

two-filters-macOS-2025-11-18  ( 32 MB )

two-filters-Linux-2025-11-18  ( 14 MB )