# JAX P2 - Pitch Shifter II — Audio Unit (AUv3)

> Real-time audio pitch shifter for polyphonic material using a delay-based approach. (iPhone/iPad app by Jens Guell.)

- Source: https://appshunter.io/ios/app/jax-p2-pitch-shifter-ii/id1533091474 (this page in markdown: same URL + `.md`)
- Developer: [Jens Guell](https://appshunter.io/developer/1195004865)
- Category: Music, Utilities, Music
- Price: $19.99
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 33 MB
- Languages: English
- Released: 2020-09-26
- Data updated: 2026-07-29
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/jax-p2-pitch-shifter-ii/id1533091474/reviews.md

## What is JAX P2?

A time domain pitch shifter will virtually modify the speed of audio playback. But there is a certain problem with this. A continuous audio stream (like realtime processing) is usually absolutely constant in its sample rate and buffer size. And also nobody can shift the time in the real world (yet!?). 

This is very different when using just a sampler. A sampler will have access to a complete sound sample in memory and can play back at any sample rate, thus making it longer or shorter in time, raising or lowering the pitch this way. 

A continuous stream is always fixed in the sample rate and the playback time cannot be modified without discontinuity.

Some tricks can be used, for modifying the playback speed virtually. We use a delay based approach, where 2 slightly time shifted overlapping delay buffers are filled with continuous data streams and then a windowing function is used to merge these two buffers together again without any crackles. The buffers are constant in length and a short variable latency will be introduced, that is pitch dependent.

This way, the speed of the reading pointer can be adjusted in realtime to a fractional part of the current sample rate. This all sounds quite simple, but in reality it is complex coding and also will produce some unavoidable side effects. Extreme values tend to become grainy.

The good news are, this takes polyphonic (in fact any) material and shifts its pitch without a problem. All transients and the formants are shifted equally with the pitch, which produces the typical “chipmunkeyfication”. 

The time domain approach is better situated for usage with transient material, because it will not smear so much as the frequency domain approach of JAX ESSENTIAL SERIES P3.

## Key features

- Real-time pitch shifting
- Delay-based approach
- Preserves transients and formants
- Handles polyphonic material
- AUv3 Audio Unit compatibility

## Chart rankings

- #196 in Top Paid · Music (US App Store)

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/jax-p2-pitch-shifter-ii/id1533091474/reviews.md

### 5/5 — Solid algorithm

*2020-12-17*

A couple requests
- could it be possible to double tap the knobs to return to default. 
- !!! Could the midi input PLEASE have midi notes as an options, cc’s are cool but notes would be so easy to make this a musical tool and correspond to the gui already. !!! In AUM Its the most easy to use the tool straight away with AUM’s built in keyboard assigned to this plugin and press the keys and start changing pitch but alas no go. Further assigning an arp(though slow;) or fugue machine would be perfect. 

🙏🏽 thanks!

## Frequently asked questions about JAX P2

### What is JAX P2 - Pitch Shifter II?

JAX P2 - Pitch Shifter II is an audio effect application that allows for real-time pitch shifting of audio streams. It utilizes a delay-based approach to modify playback speed without introducing crackles.

### How does JAX P2 - Pitch Shifter II handle polyphonic material?

This app is designed to handle polyphonic (and any) material effectively. It shifts transients and formants equally with the pitch, resulting in a characteristic "chipmunkeyfication" sound.

### What is the price of JAX P2 - Pitch Shifter II?

JAX P2 - Pitch Shifter II is available for a one-time purchase of $14.99.

### What devices does JAX P2 - Pitch Shifter II support?

JAX P2 - Pitch Shifter II is compatible with iPhone, iPad, and iPod devices.

### How often is JAX P2 - Pitch Shifter II updated?

The latest version, 1.2, was released on March 3, 2024. Updates are provided by the developer, Jens Guell, to ensure reliability and introduce improvements.

### What is the age rating for JAX P2 - Pitch Shifter II?

JAX P2 - Pitch Shifter II has an age rating of 4+, making it suitable for a wide range of users.

### Does JAX P2 - Pitch Shifter II have ads?

No, JAX P2 - Pitch Shifter II does not contain advertisements. It is a paid application without any ad interruptions.

### What makes the time domain approach in JAX P2 - Pitch Shifter II unique?

The time domain approach used in JAX P2 - Pitch Shifter II is better suited for transient material as it avoids smearing, unlike frequency domain approaches. This results in cleaner processing for percussive sounds.

## Version history (last 2 releases)

### 1.2 — 2024-03-03

The product (AudioUnit AUv3) was updated for support of latest Apple technologies and frameworks (architecture: arm64).
Minimal iOS target is still 12.0. It also should work on the Vision Pro (compatibility mode).

### 1.1 — 2020-09-26

No release notes.

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## More apps by Jens Guell

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- [MIDI SWEET : Clock Sync (AU)](https://appshunter.io/ios/app/midi-sweet-clock-sync-au/id1454284852)
- [JAF Model One](https://appshunter.io/ios/app/jaf-model-one/id1472652593)
- [JAF Collection](https://appshunter.io/ios/app/jaf-collection/id1472896422)
- [JAX Stereo Tool (AU)](https://appshunter.io/ios/app/jax-stereo-tool-au/id1473390302)
- [JAX !Make Louder (Audio Unit)](https://appshunter.io/ios/app/jax-make-louder-audio-unit/id1474614677)

All apps by Jens Guell: https://appshunter.io/developer/1195004865

## Related topics

[audio pitch effect](https://appshunter.io/ios/topics/audio-pitch-effect)

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*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 2026-07-29.*