# JAX Convolutor PE (Audio Unit) — Reverb Effect Preset Edition > Stereo convolution reverb effect app with 120+ included impulse response files. (iPhone/iPad app by Jens Guell.) - Source: https://appshunter.io/ios/app/jax-convolutor-pe-audio-unit/id1492522404 (this page in markdown: same URL + `.md`) - Developer: [Jens Guell](https://appshunter.io/developer/1195004865) - Category: Music, Productivity, Music - Price: $9.99 - Rating: 4.94/5 from 18 App Store ratings · 8 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 139 MB - Languages: English - Released: 2019-12-31 - Data updated: 2026-07-28 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/jax-convolutor-pe-audio-unit/id1492522404/reviews.md ## What is JAX Convolutor PE (Audio Unit)? Remarks:  This edition of the JAX Convolutor uses over 120 included IR Files for reverberation. All functionality is enabled (except loading own files). The upcoming JAX Convolutor PRO will allow to import / load unlimited individual IR files. Please understand that convolution uses conceptionally much CPU and requires larger rendering buffers to perform successfully. JAX Convolutors are consequently stereo processing convolutors, that are optimized for usage with very large IR files. This allows them to be used as mastering reverbs. Convolution effects are well known and commonly used in music production since many years. Convolution is a highly complex signal processing approach, that needs some certain computation power. The recorded impulse response of a real world environment is used to render a reverberation effect onto any audio material, so that it sounds like the source was played in that original room or location. Some further adjustments and manipulations can be applied to refine these results in realtime. IR files are mostly files recorded with special equipment, but basically are just usual audio files (srereo) with a reverberated sound of an ultra short impulse. It is even possible to capture synthetic reverbs and other effects with this technique, for instance from famous ancient vintage equipment, as rare plate and spring reverbs. If other kind of files are used, some wired special effects can be achieved thru convolution or just some kind of creative audio garbage. But also rhythmic effects are possible when the correct IR sizes are used (correctly adopted to the current tempo of the composition). A comprehensive manual is shipped with the app. ## Key features - 120+ included IR files - Stereo processing - Mastering reverb quality - Real-time adjustments - Creative audio effects - Rhythmic effect possibilities ## Recent user reviews (8 of 8) All indexed reviews: https://appshunter.io/ios/app/jax-convolutor-pe-audio-unit/id1492522404/reviews.md ### 5/5 — Free! *2020-01-11, version 1.9* Thank you for the free convolution reverb. A little bumpy at first, but everything fixed with update. Looking forward to purchasing the pro version. Enjoying all of your effects. Please make more! ### 5/5 — Sounds Great *2020-01-07, version 1.7* Like all of this devs apps. ### 5/5 — Excellent, and not comparable to other convolution apps on iOS *2020-01-06, version 1.7* This app stands alone in that it is the only true stereo convolution reverb AUv3 on iOS. For that alone you should get it. It will use more CPU, because stereo processing is more intensive, but this is the only way to get a true stereo convolution reverb. ### 5/5 — High quality *2020-01-06, version 1.7* Fantastic reverb and look forward to the pro version Thanks for bringing this to iOS! ### 5/5 — Outstanding reverb *2020-01-06, version 1.7* I particularly like the more experimental convolution files. One thing to note is that it requires high latency settings, particularly on older devices. Might be a concern for live uses. Not a criticism, it’s in the nature of the thing. ### 5/5 — Reverb *2020-01-06, version 1.7* I have started to delve into this free version of your Convolution reverb. Yep, at first impression it sounds great and the ability to adjust the impulses is quite innovative. Though your apps do have their quirks in the gui department, I have come to realise that that is your way and as an artist myself I totally understand that, they are a great compliment to any iOS music producer. Keep them coming. Looking forward to the release of the full pro version. You can find me on the AB forum as ,’Gravitas’. ### 5/5 — True Stereo Convolution *2020-01-04, version 1.7* After further testing of other AU convolution reverbs using sources with a wide source imaging, I am revising my review and upgrading this reverb to five stars. This reverb seems to be the only AU convolution app that does real stereo to stereo processing. As a result, it needs more CPU than the other convolution AU plugins. Those plugins process the left input only through the left IR channel and right channel through the right. While that can sound nice in many circumstances, it will sound very wrong if the source has some sounds that are panned strongly. Let’s say you have an instrument hard panned left. It’s reverberation should not be only be heard from the left speaker. With the two other AUs, I tested, a hard-panned source only reverberated on the side it was panned to. This saves a lot of CPU but messes with the imaging and is very unnatural. Convolutor, on the other hand, processes both left and right inputs in full stereo. So, it needs to do more processing. In situations where your source has wide panning, you will notice a much better result. As a result of the processing, you may need to increase your buffer sizes to get playback without crackling, but that is a reasonable price when you need the more detailed imaging. It would be worthwhile for this plugin to have a switches to do “half-stereo” or “mono-to-stereo” for those cases where you are okay with compromising the imaging in exchange for less cpu use. ### 5/5 — Way to go 👍 *2020-01-01, version 1.6* Sounds fab so far thx for throwing a bone with this one for the issue with your other exciting new app. ## Frequently asked questions about JAX Convolutor PE (Audio Unit) ### What is JAX Convolutor PE? JAX Convolutor PE is a stereo convolution reverb effect app that uses impulse response (IR) files to create reverberation. It comes with over 120 included IR files and is optimized for high-quality audio processing. ### Can I load my own IR files into JAX Convolutor PE? This edition of JAX Convolutor PE does not allow you to load your own IR files. All functionality is enabled except for importing custom files. A future PRO version will offer this capability. ### How does convolution reverb work? Convolution reverb uses the recorded impulse response of a real-world environment or effect to apply reverberation to any audio material. This makes the audio sound as if it were played in that original space or through that specific vintage equipment. ### Is JAX Convolutor PE suitable for mastering? Yes, JAX Convolutor PE is designed for usage with very large IR files, allowing it to be used as a mastering reverb. Its stereo processing is optimized for high-quality reverberation. ### What devices does JAX Convolutor PE support? JAX Convolutor PE is supported on iPhone, iPad, and iPod. It is available as an Audio Unit (AUv3) plugin. ### What is the price of JAX Convolutor PE? JAX Convolutor PE is a paid application priced at $9.99. There are no in-app purchases or subscriptions for this edition. ### How often is JAX Convolutor PE updated? The app was last updated on March 3, 2024, with version 1.96. This indicates a relatively active development cycle for the application. ### Does JAX Convolutor PE have ads? No, JAX Convolutor PE does not contain advertisements. As a paid application, it offers an ad-free experience for users. ## Version history (last 5 releases) ### 1.96 — 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). ### 1.95 — 2020-01-14 Maintenance update version 1.95 This version of the free JAX Convolutor PE was synchronized with the current release of the JAX Convolutor PRO. ### 1.9 — 2020-01-10 Maintenance Update Version 1.9 - We synchronized the everything with the current release of JAX Convolutor PRO Please read JAX Convolutor PRO release notes. ### 1.8 — 2020-01-08 Version 1.8 Performance & Maintenance Update JAX Convolutor is due to its processing architecture an audio unit that requires larger rendering buffers in general. Please read the articles on our website https://midi.digitster.com - A factory preset loading problem was corrected. The default factory presets were all initialized to zeroes, which resulted in silence after selection. There are no useful presets yet either. This will be implemented with the PRO version. Background: AUv3 does not allow to save IR files or file names with the presets, only floating point parameters are supported. This is a huge problem and it's unthought. We currently solved this by creating an internal database, where only an index to the IR file is saved with the presets. IR files are automatically registered upon import and a unique index number is assigned. But if the IR file is deleted manually i.e., this index may become invalid. - We changed the Audio Unit to support 48000 Hz. Previous version were rendering at 44100 Hz. This change was made for the reason, that all latest Apple (PRO) devices are fixed to 48000 Hz system sample rate per default. Possibly this will lead to slightly higher CPU usage on older Apple devices, as these use 44100 Hz per default. - We provided the included IR files for native support of 48000 Hz, 32 bit floating point data. JAX Convolutor does still convert all IRs when importing to 32 bit data audio, which is the native processing format in iOS. These files will load faster and prevent conversion upon loading. Please note, that old distributed files may be misinterpreted in length now. - Latest 'black hat' optimizations were removed and replaced with some 'gray hat' optimizations, reducing current CPU impact (of latest version 1.7) again. Technically we reduced the convolution range by disabling convolution processing for (nearly) inaudible frequencies. This still reduces entire possible quality but may deliver significant better quality than the competitors by reducing the CPU hit significantly. Rather than processing milliards of inaudible samples per second and wasting precious CPU. Our JAX Convolutor is a special realtime stereo to stereo processing unit (was originally thought as a True Stereo convolution, using 4 different (or even just more) convolution channels). That means there are at least 2 completely independent *dynamic* convolution engines for the right and the left input channels, that should be processed thru a high quality stereo IR at least, making it suitable for using as a mastering reverb for instance. So our audio unit will use twice as much performance as some other, ... eeerrrm ... much more simple, static convolution effects. It also very much depends on the used realtime parameters which and how many convolutions are involved and how these are mixed together, this is the main reason for higher CPU usage, because it's a highly dynamic convolution approach. Users have the possibility to control CPU hit manually by using our advanced S.R.C. technology (Selective Range Convolution) with range filter 2. This filter has some noticeable latency. S.R.C. is in fact a FFT filter, implemented directly into the convolution kernel, reducing the convolution CPU hit this way (the selective frequency range being effectively convoluted). If that does not work for you, please use the other filter modi, which are build on an analog models, better for realtime automation and more drastic results. - Parameter smoothing for all realtime convolution parameters was implemented to prevent the automation zipper noise. - Advanced direct MIDI automation will be implemented into JAX Convolutor PRO only. [ insufficient space / for complete description please go to our product website ] ### 1.7 — 2020-01-02 Version 1.7 Maintenance Update - There was a broken piece of code due to a forgotten debugging option, that prevented the processor to apply S.R.C. on both stereo channels. Only the left stereo channel was processed with our 'Selective Range Convolution'. The right channel always was processing with full range convolution. This has been fixed now. - The S.R.C filter range parameters have been adjusted to a more logarithmic scale. Selective Range Convolution is our special optimization technology for full convolution processing, which implements a range filter directly into the kernel of the convolution processor. This filter is able to perform additional filtering of the reverberation effect along with a significant reduction of the entire CPU load. - We increased the loudness of the resulting reverberation. Further Performance optimizations - We reduced the CPU usage by another (quite drastic) performance optimization. Also older devices should now be able to use JAX Convolutor PE. We assume, that most of the released competitor products do not really perform a full convolution but use some dirty tricks, merely doing a half convolution or another kind of reduced convolution processing... However, we are able do that too. But this will reduce the quality of the convolution. And we won't provide such software *silently hiding the facts* as being a high quality convolution processor. Please understand, that JAX Convolutor is a true stereo processing convolution effect, supposed to deliver highest quality. The JAX Convolutor Pro now includes the option to switch between performance mode and high quality mode. 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-28.*