# P422 Fairuz — 4-Band Op-Amp Parametric EQ

> 4-Band Op-Amp Parametric EQ (iPhone/iPad app by Pulsar Modular.)

- Source: https://appshunter.io/ios/app/p422-fairuz/id6801470405 (this page in markdown: same URL + `.md`)
- Developer: [Pulsar Modular](https://appshunter.io/developer/6793457903)
- Category: Music, Productivity
- Price: $19.99
- Age rating: 4+
- Requires: iOS 15.0 · 43 MB
- Released: 2026-08-19
- Data updated: 2026-09-05
- User reviews in markdown: https://appshunter.io/ios/app/p422-fairuz/id6801470405/reviews.md

## What is P422 Fairuz?

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: the VOICE input transformer control and HAMMER output stage add 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
- VOICE input transformer and HAMMER output stage saturation
- MIX parallel blend and Dual Mono L/R behavior
- Real-time IN/OUT spectrum analyzer with zoom
- A/B states and 275+ factory presets with 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.


## Version history (last 2 releases)

### 2.1.0 — 2026-08-21

What's new in 2.1.0

• HIGH and HI-MID bands are now crystal clear at the top: the filter curves keep their true shape right up to the edge of hearing, identical at every sample rate. Your existing presets and sessions sound exactly the same as before.
• Fixed: at sample rates between 48 and 88.2 kHz the whole mix was being softened by a protection filter.
• TREMOR's analog movement is back to its slow, organic drift.
• The spectrum visualizer now follows your presets: it opens or closes with the preset you load.
• Preset browser: Save stores into the selected folder, Rename never overwrites an existing name, deleting a folder always asks first, and Delete greys out when there is nothing to delete.
• Switching oversampling during playback is now glitch-free, CPU use is lower with the visualizer closed, and the response display has a higher resolution.
• Several stability fixes.
• About window tidied up on iPad and iPhone.

Requires iOS 15 or later.

### 2.0.4 — 2026-08-19

No release notes.

## More apps by Pulsar Modular

- [P410 Joyride](https://appshunter.io/ios/app/p410-joyride/id6793457901)
- [Q Sahara](https://appshunter.io/ios/app/q-sahara/id6794289830)
- [P252 MDN Diode](https://appshunter.io/ios/app/p252-mdn-diode/id6804660463)

All apps by Pulsar Modular: https://appshunter.io/developer/6793457903

---

*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 2026-09-05.*