Comparison

EG ModernFX AU3 Multi effects vs GSDSP Quantum Delay

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

EG ModernFX AU3 Multi effects

Enhance your audio tracks with a variety of modern multieffects. This app offers 8 distinct effects, each with adjustable parameters and the ability to be bypassed. It supports AU3 multi-output and MIDI CC automation for flexible integration into your digital audio workstation.

Highlights
  • 8 modern audio effects
  • Tweakable effects with bypass
  • AU3 multi-output support
  • MIDI CC automation
  • Multitouch effect modulation
  • Live mode for on-the-fly effects
  • Reorderable effect chain
  • Preset saving and randomization
Features
Read full description

EG ModernFX is a simple, fast and fun to use way to add multieffects to your audio tracks. Features: - 8 modern effects - Bitcrusher, Ring Modulation, Fuzz Octaver, Vintage Saturation, Full-Wave Rectification Distortion, Resonant Filter, Auto Pan, Stereo Spread - each effect is tweakable and can be bypassed (double tap on the mix slider) - AU3 multi-output - send each effect to a different output bus - Each parameter can be automated via MIDI cc in your favorite daw - Multitouch effect view to modulate effects to temporary state - Live mode to apply effects on the fly and bypass them on release - Effect chain can be re ordered - Presets saving - Randomize effects parameters - Built-in automation - Built in presets created by Eyal Levy and Jamie Mallender PLEASE NOTE: This is not a standalone app, but you need an AU3 compatible host like n-Track, AUM, Auria, Cubasis or Beatmaker3

About

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.

Highlights
  • 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)
Features
Read full description

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

EG ModernFX AU3 Multi effects3 screens
GSDSP Quantum Delay3 screens

Verdict

The call

The clearest difference is price: EG ModernFX AU3 Multi effects at $3.99 against GSDSP Quantum Delay's $14.99. EG ModernFX AU3 Multi effects also leads on update cadence (weekly vs every 6 weeks) and iOS requirement (8.0 vs 13.0). 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

CostPrice · In-app purchases · Ads · Monetization

EG ModernFX AU3 Multi effects costs $3.99 and GSDSP Quantum Delay $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

EG ModernFX AU3 Multi effects holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 4 and 17 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

EG ModernFX AU3 Multi effects ships an update weekly, GSDSP Quantum Delay every 6 weeks. Both last shipped on November 3, 2026.

Scorecard4 real differences · 6 level
EG ModernFX AU3 Multi effects versus GSDSP Quantum Delay: the parameters behind the verdict, then further details
ParameterEG ModernFX AU3 Multi effectsGSDSP Quantum Delay
Price$3.99 — better$14.99
Rating5.0 (4 ratings) — better4.8 (17 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings417 — better
Update frequencyWeekly — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better13.0
Further details — not scored
Size31 MB94 MB
Age rating4+4+
DeveloperElliott GarageGustav Scholda

Customer experience

EG ModernFX AU3 Multi effects

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

GSDSP Quantum Delay

All ratings17 ratings
Positive94.1%
Neutral0.0%
Negative5.9%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

EG ModernFX AU3 Multi effects

No in-app purchases

None

GSDSP Quantum Delay

No in-app purchases

Questions

Is EG ModernFX AU3 Multi effects free?
EG ModernFX AU3 Multi effects costs $3.99, with no in-app purchases.
Is GSDSP Quantum Delay free?
GSDSP Quantum Delay costs $14.99, with no in-app purchases.
Which has better reviews, EG ModernFX AU3 Multi effects or GSDSP Quantum Delay?
EG ModernFX AU3 Multi effects is rated higher. EG ModernFX AU3 Multi effects averages 5.0 out of 5 from 4 ratings, while GSDSP Quantum Delay averages 4.8 from 17 ratings.
Do EG ModernFX AU3 Multi effects or GSDSP Quantum Delay have ads?
Neither EG ModernFX AU3 Multi effects nor GSDSP Quantum Delay shows ads.
Which is updated more often, EG ModernFX AU3 Multi effects or GSDSP Quantum Delay?
EG ModernFX AU3 Multi effects ships an update weekly, and GSDSP Quantum Delay every 6 weeks. Most recently, EG ModernFX AU3 Multi effects was updated on November 3, 2026 and GSDSP Quantum Delay on November 3, 2026.

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