GSDSP Quantum Filter2026.4 - App Store

Analog warmth meets flexible routing and dynamic modulation in a filter workstation built for creative sound design.

Analog-Modelled Filters
Quantum Filter uses resonant, analog-modelled filter designs that behave smoothly and musically across the entire spectrum. With no cramping, stepping, or digital artefacts, the filters remain stable even under rapid modulation. At high resonance settings they can reach self-oscillation, similar to classic hardware circuits.

Filter Types & Routing
Choose from 11 filter modes, including Lowpass, Highpass, Bandpass, Notch, Shelving options, Bell, and Ladder Lowpass in 1-4 pole configurations. Combine filters in series (up to three stages) or parallel (up to two), resulting in over 2,000 possible routing combinations for detailed tone shaping and complex layered filtering.

Built for Modulation
Designed to handle fast, artefact-free modulation, Quantum Filter responds cleanly even under rapid parameter changes. Its stability makes it suitable for dynamic environments, rhythmic modulation, or complex movement across multiple filter stages.

Stereo and Dual Mono
Switch between stereo and dual mono modes to shape the stereo image. In dual mono mode, left and right channels can move independently, enabling asymmetric movement, wider imaging, or separate modulation paths for each side.

MIDI Control
Quantum Filter integrates ADSR & AR modulators that respond directly to MIDI, allowing envelope-driven filter motion that behaves like a synthesizer’s filter section. This integration adds expressive control for rhythmic gating, animated sweeps, and dynamic shaping based on your playing or sequencing.

Quantum Filter is an AUv3 audio effect plugin compatible with Logic Pro, AUM, Cubasis, GarageBand and many more.
A Desktop version is also available for Windows and macOS (VST3 / AU / AAX).

More information here: https://gs-dsp.com/products

Version History - New: Add your most-used presets to the new Favourites category for quick access
- Improved Apple Pencil compatibility
- Faster startup time 2026.4 Jun 17 - New: Added smooth functionality to 2D Macro
- Reduced memory usage
- Faster startup time 2026.3 Apr 30 - New: Custom LFO curves can now be saved and loaded across all GS DSP plugins
- New: Custom LFO wide view for more detailed editing
- New: User Manuals for each plugin, access them in the menu: Learn -> User Manual
- Improved stability with Logic Pro
- Fixed an issue where the initial random preset got marked dirty
- Quantum Delay: Added 40 new presets by Jakob Haq
- Quantum Delay/Granulator: Fixed an issue where some preset subcategories were duplicated 2026.2 Apr 15 - New: Modulation Range Info now displays a text representation of the applied modulation range (current / min / max)
- Magic Series: The active curve in the Curve Editor can now be randomized (add random points and/or move existing ones)
- Fixed an issue when switching presets via MIDI Program Change messages (Thanks Maxim)
- Fixed the LFO "Round" wavetable 2026.1 Mar 11 - Added Copy-Paste functionality to the Modulation System: Copy any modulator and paste it into another slot
- Show all modulators as turned off if globally turned off to avoid confusion
- Improved area for lock toggles
- Improved activation window and notification popup layouts
- Fixed a few issues for Gate & Trigger modes in combination with unipolar modulators & Custom LFO 2026.0 Jan 26 - Completely redesigned UI: Hi-res knobs and sliders, improved layouts and skins
- Gate and Trigger modes for LFOs and Random modulators
- Single Slider with BPM tpye grid control for LFOs and Random modulators
- New PulseTrain modulator
- Improved Follower range handles 2025.5 12/18/2025 - More MIDI modulators: Pitchwheel, Velocity, Pedal & Aftertouch
- Added a "Assign Modulator" label to a modulator if no parameter is assigned
- Improved Expand / Collapse behaviour of Modulation System 2025.4 05/19/2025 - Fixed an issue where LFOs didn't sync properly in Ableton 12 2025.3 05/06/2025 - Macro Labels (also 2D and Switch) can be edited and are stored with the preset
- Improved the way we show modulators which are turned off
- Locked parameters are now defined per plugin instance instead of globally
- Improved touch are for spinbox for iPhone
- Fixed an issue with MIDI inputs for CrossModulators
- Fixed an issue when freezing a track in Ableton 12 2025.2 05/05/2025 - MIDI CC and MIDI Note modulator now display the current value so it's easier to set your range
- Improved the dirty-check for presets
- Improved how the Modulation Board expands and collapses
- Fixed an issue where the LFO wasn't displaying the right Hz value when unsynced
- Fixed an issue where some hosts were not always informed about program changes 2025.1 01/29/2025 - Cross Modulation: Modulate modulators by expanding a second modulation board. Infinite ways to combine modulators!
- Added Macro Switch
- Added Random Switch
- Added an option to load a random preset to the preset menu
- Smoother drawing of modulation
- Optimized UI load time 2025.0 01/16/2025 - Improved MIDI support: AUv3 plugins now include an 'aumf' version so you can send and receive MIDI directly from the plugin
- On startup the plugin will load a random preset (to load the default instead tick Menu-> Manage Presets-> Load Default on Startup)
- Fixed an issue where some dB sliders were not showing -inf dB when fully down 2024.10 11/13/2024 - Fixed an issue loading the 2D Macro modulator 2024.8 10/09/2024 - New MIDI CC modulator
- New MIDI Note modulator
- New 2D Double Spiral modulator
- New 2D Chaotic Drop modulator
- Improved Preset system: Edit subcategory and preset from the redesigned popup menu
- Improved Smoothing for Followers, Macros & Motion3D modulators
- Load a built-in preset on startup: If you prefer to load the default preset like before you can change that in Settings Menu-> Manage Presets
- Modulators don't reset on BPM change in AUM (Thanks Gav!) 2024.7 10/08/2024 2024.6 07/29/2024