VAMono vs GSDSP Quantum Delay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VAMono
This app is a virtual analog monophonic synthesizer inspired by classic 80s synths. It features two oscillators, a versatile filter, and built-in effects like distortion and delay. A 64-step sequencer allows for note and parameter automation.
- Virtual analog monophonic synthesizer
- Two oscillators with extensive modulation
- 24 dB lowpass filter
- Distortion and delay effects
- 64-step sequencer for notes and parameters
- AudioUnit Extension (AUv3) and Stand Alone modes
- Ableton Link and Bluetooth MIDI support
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VAMono is a virtual analog monophonic synthesizer inspired by iconic monophonic analog synthesizers of the 80's. The oscillators are capable of wide variety of modulation to shape the sound before the filtering stage. Pitch, shape and pulse width can be modulated by LFO, ADSR envelope. Xmod and Ring modulation offers audio rate modulation. Hard Sync offers a characteristic sync sound. Filter section and Amplifier offers classic sound of the iconic analog synthesizer of 80’s. Amp section additionally offers amplitude modulation followed by distortion and delay effect. VAMono offers built-in 64 step sequencer to sequence notes and parameters. Synthesizer and Sequencer can be used as an AudioUnit Extension (AUv3) or Stand Alone. Stand Alone Mode supports Ableton Link, Bluetooth MIDI and MIDI IN/OUT. Main Features AudioUnit Extension (AUv3) - Virtual Analog Monophonic Synthesizer features two oscillators, one LFO, one lowpass filter, three envelope generator, one amplifier, distortion and delay effect. - Oscillators are capable of producing continuously variable wave shapes and offers variety of modulation. - Features two Amp Envelopes, Gate and ADSR. ADSR envelope is analog style non-linear envelope generator. - 24 dB per octave lowpass filter and amplifier produces characteristic sound of iconic analog synthesizer in 80’s - LFO provides seven wave shapes and can be synced with tempo. Distortion and delay effects are included. Sequencer - Sample accurate 64 step sequencer capable of sequencing notes and parameter automation. - Synthesizer and sequencer work as AudioUnit Extension (AUv3) and as Stand Alone. - MIDI input and output - 60 factory patches Stand Alone (AU Host Application) - Support Ableton Link - Support Bluetooth MIDI - MIDI input and output System Requirements - iOS 14.2 or later (VAMono utilizes features introduced in iOS 14 and it is not backward compatible.)
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
Screenshots
Verdict
The clearest difference is review sentiment: GSDSP Quantum Delay at 100% against VAMono's 83%. GSDSP Quantum Delay also leads on rating (4.8 vs 4.6) and iOS requirement (12.0 vs 14.2). VAMono's advantage is update cadence (every 2 weeks vs every 5 weeks). On price, ratings volume, 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
VAMono costs $14.99 and GSDSP Quantum Delay $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.
GSDSP Quantum Delay holds the better App Store score, 4.8 against 4.6. Both are backed by a comparable volume of ratings — 12 and 17 respectively. Written reviews point the same way: 83% of VAMono's written reviews are positive against 100% of GSDSP Quantum Delay's.
VAMono ships an update every 2 weeks, GSDSP Quantum Delay every 5 weeks. The most recent releases landed on September 20, 2026 and September 22, 2026 respectively.
| Parameter | VAMono | GSDSP Quantum Delay |
|---|---|---|
| Price | $14.99 | $14.99 |
| Rating | 4.6 (12 ratings) | 4.8 (17 ratings) — better |
| Positive reviews | 83.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 12 | 17 — better |
| Update frequency | Every 2 weeks — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 14.2 | 12.0 — better |
| Further details — not scored | ||
| Size | 21 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryo Togawa | Gustav Scholda |
Customer experience
VAMono
GSDSP Quantum Delay
In-app purchases
VAMono
No in-app purchases
GSDSP Quantum Delay
No in-app purchases









