# JAX P3 - Pitch Shifter III — Audio Unit (AUv3) > Real-time pitch and frequency shifter using phase vocoder technology. (iPhone/iPad app by Jens Guell.) - Source: https://appshunter.io/ios/app/jax-p3-pitch-shifter-iii/id1533091834 (this page in markdown: same URL + `.md`) - Developer: [Jens Guell](https://appshunter.io/developer/1195004865) - Category: Music, Utilities, Music - Price: $19.99 - Rating: 3.75/5 from 4 App Store ratings · 3 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-p3-pitch-shifter-iii/id1533091834/reviews.md ## What is JAX P3? Our frequency domain approach for pitch shifting will use the “phase vocoder” method, that effectively is an FFT/inverse FFT. The term “vocoder” is somewhat misleading here, because it has nothing to do with a real “vocoder”. FFT will introduce latency too, but the buffers can be kept relatively small and the input can be shifted by exactly this fixed amount of latency for the final mix internally. Complex mathematical formulas will be used to extract the frequency components from the signal and their corresponding magnitudes. After the frequency is known, it can be modified in controlled manner, thus making pitch and frequency shifting possible in realtime. If the frequency was modified across all magnitudes equally, the inverse FFT is applied, leaving the audio with a changed pitch. Like the time domain approach of JAX ESSENTIAL SERIES P2, this will produce “chipmonkeyfication” effects, because all transients and formants will be shifted this way too, proportional with the fundamental frequency. The frequency domain approach has some side effects too. The audio will be smeared slightly but equally across the entire range. Grainy results are less audible than with the time domain approach. It is not well situated for using with strong transient audio material. Excellent results can be achieved with ambient audio material. ## Key features - Frequency domain pitch shifting - Phase vocoder method - Real-time audio manipulation - FFT/inverse FFT processing - Adjustable latency - Suitable for ambient audio ## Chart rankings - #197 in Top Paid · Music (US App Store) ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/jax-p3-pitch-shifter-iii/id1533091834/reviews.md ### 4/5 — Great but could use optimization *2024-10-20* Too processor intensive - should be able to get that way down on apple silicon devices. ### 2/5 — Could use optimization for apple silicon *2024-08-09* Too processor intensive - should be able to get that way down on apple silicon devices. ### 4/5 — The Pitch Shifter I’ve been looking for!! *2021-01-18* This app is so easy to use to change the key of an audio file or detune it. Seems to be the only app on ios that can do that smoothly. The other auv3’s for pitch shifting seems to be aimed towards the ones who want to just create a chorus like effect or auto tune singing. I love this app and it took me so long to find it, but please add the feature of typing in the exact number value of the detune. ## Frequently asked questions about JAX P3 ### What is JAX P3's primary function? JAX P3 is an audio effect processor that specializes in real-time pitch and frequency shifting using a phase vocoder method. It manipulates audio signals in the frequency domain to alter their pitch. ### What kind of audio material does JAX P3 work best with? This processor achieves excellent results with ambient audio material. It is less suited for audio with strong transients due to potential smearing effects. ### How does JAX P3 handle latency? JAX P3 uses FFT/inverse FFT processing, which introduces latency. However, the buffers can be kept small, and the input can be shifted by a fixed amount of latency internally for the final mix. ### What is the price of JAX P3? JAX P3 is available for a one-time purchase of $9.99. ### On which devices can JAX P3 be used? JAX P3 is compatible with iPhone, iPad, and iPod devices. ### How often is JAX P3 updated? The latest version, 1.2, was released on March 3, 2024. Updates are released periodically to improve functionality and compatibility. ### What is the age rating for JAX P3? JAX P3 has an age rating of 4+, making it suitable for a wide range of users. ### Does JAX P3 have ads? No, JAX P3 does not contain advertisements. It is a paid application without any ad interruptions. ## 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. ## More apps by Jens Guell - [GM MIDI Player](https://appshunter.io/ios/app/gm-midi-player/id1445780869) - [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 --- *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.*