# GSDSP Quantum Filter — EQ / Filter with Modulation

> Analog-modeled filter workstation for creative sound design and audio modulation. (iPhone/iPad app by Gustav Scholda.)

- Source: https://appshunter.io/ios/app/gsdsp-quantum-filter/id6498711920 (this page in markdown: same URL + `.md`)
- Developer: [Gustav Scholda](https://appshunter.io/developer/1642323227)
- Category: Music
- Price: $14.99
- Rating: 5.00/5 from 3 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 77 MB
- Released: 2024-07-29
- Data updated: 2026-08-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gsdsp-quantum-filter/id6498711920/reviews.md

## What is GSDSP Quantum Filter?

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

## Key features

- Analog-modelled filters
- 11 filter modes
- Series and parallel routing
- Dynamic modulation support
- Stereo and dual mono modes
- MIDI control integration

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/gsdsp-quantum-filter/id6498711920/reviews.md

### 5/5 — Love it

*2024-12-10*

Really love all the GSDSP. Really creative

### 5/5 — Bundle store glitch

*2024-11-22*

Love and i have bought nearly all your apps yet:

For whatever reason for all bundles show a dramatically higher price than outright getting the apps separately soo, please fix 🙏

**Developer response:** Thank you so much for the praise and support. We love that you love our apps. 

We have filed a ticket with Apple regarding the Bundle price issue and are waiting to hear back  🤞

## Frequently asked questions about GSDSP Quantum Filter

### What is GSDSP Quantum Filter?

GSDSP Quantum Filter is an AUv3 audio effect plugin designed for creative sound design. It offers analog-modelled filters with flexible routing and dynamic modulation capabilities for detailed tone shaping.

### What filter types does GSDSP Quantum Filter offer?

GSDSP Quantum Filter includes 11 filter modes such as Lowpass, Highpass, Bandpass, Notch, Shelving, and Ladder Lowpass, available in 1–4 pole configurations.

### Can I combine filters in GSDSP Quantum Filter?

Yes, you can combine filters in series (up to three stages) or parallel (up to two stages), allowing for over 2,000 possible routing combinations for complex filtering.

### Does GSDSP Quantum Filter support modulation?

Yes, GSDSP Quantum Filter is built for modulation and responds cleanly to rapid parameter changes, making it suitable for dynamic environments and rhythmic effects.

### What platforms is GSDSP Quantum Filter available on?

GSDSP Quantum Filter is an AUv3 audio effect plugin compatible with iOS devices like iPhone, iPad, and iPod. A desktop version is also available for Windows and macOS.

### How much does GSDSP Quantum Filter cost?

GSDSP Quantum Filter is a paid application, priced at $14.99. There are no in-app purchases or subscriptions mentioned.

### Does GSDSP Quantum Filter have ads?

No, GSDSP Quantum Filter does not contain advertisements. It is a premium paid application.

### When was GSDSP Quantum Filter last updated?

GSDSP Quantum Filter was last updated on April 30, 2026, with version 2026.3. The app was initially released on July 29, 2024.

## Version history (last 5 releases)

### 2026.4 — 2026-06-17

- New: Add your most-used presets to the new Favourites category for quick access
- Improved Apple Pencil compatibility
- Faster startup time

### 2026.3 — 2026-04-30

- New: Added smooth functionality to 2D Macro
- Reduced memory usage
- Faster startup time

### 2026.2 — 2026-04-15

- 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

### 2026.1 — 2026-03-11

- 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

### 2026.0 — 2026-01-26

- 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

## Apps similar to GSDSP Quantum Filter

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [VAPolyQuad](https://appshunter.io/ios/app/vapolyquad/id6504518079) | 4.4 (5) | $14.99 | Music |
| [luapsel](https://appshunter.io/ios/app/luapsel/id6569224196) | 4.5 (4) | $0.99 | Music |
| [Note to Be - MIDI Quantizer](https://appshunter.io/ios/app/note-to-be-midi-quantizer/id6596771972) | 4.9 (7) | $4.99 | Music |
| [Ringotron](https://appshunter.io/ios/app/ringotron/id6474263444) | 5.0 (13) | $8.99 | Music |
| [VAMonoMkII](https://appshunter.io/ios/app/vamonomkii/id6502985768) | 5.0 (4) | $14.99 | Music |
| [midifruuze](https://appshunter.io/ios/app/midifruuze/id6504027734) | 4.8 (6) | $3.99 | Music |

## More apps by Gustav Scholda

- [GSDSP MagicDelay](https://appshunter.io/ios/app/gsdsp-magicdelay/id1642323015)
- [GSDSP MagicPitch](https://appshunter.io/ios/app/gsdsp-magicpitch/id6443502193)
- [GSDSP MagicBlur](https://appshunter.io/ios/app/gsdsp-magicblur/id6443502283)
- [GSDSP MMM](https://appshunter.io/ios/app/gsdsp-mmm/id6443846329)
- [GSDSP MagicFusion](https://appshunter.io/ios/app/gsdsp-magicfusion/id6446889003)
- [GSDSP MMMm](https://appshunter.io/ios/app/gsdsp-mmmm/id6450306205)

All apps by Gustav Scholda: https://appshunter.io/developer/1642323227

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-01.*