Delay Line vs P422 Fairuz
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Delay Line
This audio effect app offers a high-quality digital delay with smooth parameter control for musical echoes. It's designed to add depth and space to your sound without unwanted noise.
- High-quality digital delay
- Smooth parameter interpolation
- Feedback control
- Musical echoes
- Linear interpolation for delay time
- Comprehensive parameter smoothing
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A high-quality digital delay effect with smooth parameter interpolation and feedback control. This delay provides clean, musical echoes perfect for adding depth and space to your audio. The delay uses linear interpolation for smooth delay time changes and includes comprehensive parameter smoothing to eliminate zipper noise during real-time parameter adjustments.
P422 Fairuz
This app offers a powerful four-band parametric equalizer with selectable curves and proportional Q for precise sound shaping. It emulates classic op-amp circuits, adding harmonic density and character, with features like a sub-bass circuit and input transformer control.
- Four op-amp EQ bands with Bell/Contour/Contour X2 shapes
- Proportional Q for musical width
- TREMOR sub-bass circuit
- VOICE input transformer and HAMMER output stage saturation
- Real-time spectrum analyzer
- AUv3 plugin and standalone app
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P422 Fairuz is a four-band op-amp parametric EQ that moves past hardware — the punch and harmonic density of classic op-amp circuits, with capabilities the originals never had. Shape your sound with HIGH, HI-MID, LO-MID and LOW bands, each with three selectable curves (Bell, Contour, Contour X2) and proportional Q: wide stays wide, narrow finds itself. LO and HI shelves with complementary dip behavior, switchable HPF/LPF, and the TREMOR circuit laying a sub-bass foundation below 30 Hz. Character comes from the circuit, not just the curve: OUT drives the op-amp output stage, VOICE adds drive on top of it, and HAMMER adds the output transformer after it, for body, density and saturation — op-amp color available even with the EQ bands off. Blend it all in parallel with the MIX control, no DAW routing needed. FEATURES - Four op-amp EQ bands with Bell / Contour / Contour X2 shapes - Proportional Q — musical at any width - Stepped or continuous frequency modes - LO / HI shelves with complementary dip - TREMOR sub-bass circuit below 30 Hz - Switchable HPF / LPF with position options - Op-amp output stage: OUT drive, VOICE drive and the HAMMER output transformer - MIX parallel blend and Dual Mono L/R behavior - Spectrum visualizer: drag the band dots, tap one for its card; IN/OUT analyzer with freeze, range, resolution, speed and tilt - A/B states and 276 factory presets with notes, tags, search and favorites - Out & Trim linked gain staging - Zero latency, optional oversampling FORMATS - AUv3 plug-in for AUM, Logic Pro, GarageBand, Cubasis and other AUv3 hosts - Standalone app with mic/interface input Bring console-grade op-amp tone to your iPad and iPhone.
Screenshots
Verdict
The clearest difference is price: Delay Line at $1.99 against P422 Fairuz's $19.99. P422 Fairuz's advantage is iOS requirement (15.0 vs 17.0). On rating, 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
Delay Line costs $1.99 and P422 Fairuz $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Delay Line against 5.0 for P422 Fairuz. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
| Parameter | Delay Line | P422 Fairuz |
|---|---|---|
| Price | $1.99 — better | $19.99 |
| Rating | 5.0 (2 ratings) | 5.0 (1 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | — | Every 5 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | Callback Audio, LLC | Pulsar Modular |
Customer experience
Delay Line
P422 Fairuz
In-app purchases
Delay Line
No in-app purchases
P422 Fairuz
No in-app purchases
