GSDSP Quantum Delay vs jAmp Doubler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GSDSP Quantum Delay
This app offers a vintage-inspired stereo delay effect with advanced modulation, flexible filtering, and precise timing controls. It allows users to sculpt unique echo textures, from warm analog sounds to complex, evolving soundscapes.
- Vintage-inspired stereo delay
- Deep modulation system
- Flexible filtering (LPF, HPF, BPF)
- Precise timing controls (BPM, ms)
- Switchable stereo/dual mono modes
- Advanced modulation sources (LFO, Random, Envelope)
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A vintage-inspired delay supercharged with deep modulation, flexible filtering, and creative timing that pushes echoes into new dimensions. Classic Delay, Reinvented Quantum Delay takes the charm of a vintage stereo delay and fuses it with our next-level modulation system. Switch between the warm character of Tape mode and the pristine clarity of Fade mode, lock to BPM (including 5-tuplets) or dial in precise times in milliseconds. Use the Fine control for subtle push-and-pull micro-timing — or modulate your delay lines in ways traditional delays could only dream of. Sculpted Echoes Shape your repeats with switchable lowpass, highpass, and bandpass filters placed directly in the feedback path. Add modulation to create evolving tones, gentle movement, or drifting, frequency-shifting echoes. From warm analog-style rolls to shimmering, swirling textures, it’s all there. Feedback with Precision Control your delay tail behavior using either traditional % feedback or our modern dB-per-second decay system — ideal for predictable, musical decay even when the feedback path becomes complex. Enable Crossfeed for classic ping-pong stereo bounce, or push into Over-Feedback to create dense, self-building echoes that drift toward infinity. Stereo or Dual Mono Every section of Quantum Delay — delay, filter, and feedback — can switch between stereo and dual mono modes. Create tight, controlled stereo images or break them apart for wide, offset, unpredictable spaces. Dual mono modulation unlocks complex stereo interplay and beautifully asymmetric echoes. Modulation Without Limits Quantum Delay integrates our advanced modulation system, letting you modulate nearly anything: delay time, filters, feedback parameters, stereo controls, and more. Use LFOs, Random Generators, 2D modulators, Envelope Followers, Macros, and even chaotic systems to push your echoes far beyond traditional delay behavior. Or use our parameter randomisation feature to explore the plugin’s sound at random. Quantum Delay 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
jAmp Doubler
This audio plugin creates a stereo effect by introducing a subtle delay to one audio channel. It offers precise control over the delay time and can be managed via MIDI. Ideal for enhancing mono audio sources with a wider soundstage.
- Stereo widening effect
- Adjustable delay time (0-50 microseconds)
- MIDI control
- AUv3 plugin format
- Enhances mono audio
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Doubler is an AUv3 plugin that adds stereo effect by delaying the right channel wrt the left channel. The delay is controlled by the central knob and goes from 0 microseconds to 50 microseconds. It is possible to control this plugin via MIDI.
Screenshots
Verdict
The clearest difference is price: jAmp Doubler at Free against GSDSP Quantum Delay's $14.99. jAmp Doubler also leads on update cadence (every 9 days vs every 6 weeks). GSDSP Quantum Delay's advantage is ratings volume (17 vs 4). On rating, review sentiment, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
jAmp Doubler is free to download; GSDSP Quantum Delay costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
jAmp Doubler holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 17 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
GSDSP Quantum Delay ships an update every 6 weeks, jAmp Doubler every 9 days. The most recent releases landed on October 27, 2026 and October 12, 2026 respectively.
| Parameter | GSDSP Quantum Delay | jAmp Doubler |
|---|---|---|
| Price | $14.99 | Free — better |
| Rating | 4.8 (17 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 17 — better | 4 |
| Update frequency | Every 6 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 13.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 94 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Gustav Scholda | Jan Maes |
Customer experience
GSDSP Quantum Delay
jAmp Doubler
In-app purchases
GSDSP Quantum Delay
No in-app purchases
jAmp Doubler
No in-app purchases









