# JAX Imperior Grand Piano — Virtual Sound Module & AUv3

> Virtual grand piano sound module and AUv3 for iOS and macOS. (iPhone/iPad app by Jens Guell.)

- Source: https://appshunter.io/ios/app/jax-imperior-grand-piano/id6446004720 (this page in markdown: same URL + `.md`)
- Developer: [Jens Guell](https://appshunter.io/developer/1195004865)
- Category: Music, Music, Entertainment
- Price: $12.99 (on sale, was $24.99)
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 14.0 · 261 MB
- Languages: English
- Released: 2023-03-17
- Data updated: 2026-06-20
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/jax-imperior-grand-piano/id6446004720/reviews.md

## What is JAX Imperior Grand Piano?

Please note, that you will get a cross platform relase for all Apple devices with ONE price this way!
You can use the apps and the audio units on a macOS (universal) and iOS (universal).

The manual of the JAX Concert Grands can be found here: https://midi.digitster.com/JAX%20Concert%20Grand%20Pianos/JAX%20Superior%20Grand.pdf
There are demo videos available here (macOS): https://youtu.be/EBk2gvPkPA8
or here (iOS): https://youtu.be/XWhR--KtPWQ

The JAX Imperior, one of our Concert Grand Piano Collection pianos is a virtual piano (sound module and audio unit) with a set of selected American style piano models.

The very special here is optimization for mobile devices, because it is using low resources while it delivers still better sonic qualities than gigabyte heavy sampled pianos, which mostly are not very well suted for mobile devices due to ther enormous usage of disk space and memory. A JAX Concert Grand will merely use around 50 to 100 MB of effective memory with a selected model.

For the series we developed some advanced features (i.e. simulation of string and body resonances) and took special care of expressivity without rasterized steps in the velocity of max. 128 possible values. An artefakt you often will hear with sampled pianos is velocity switching, because sampled velocity layers are usually insufficient for supporting the full dynamic range of a real piano.

The Superior was the very first release of more to come with this series: For instance our set of American style (Imperior) and Japanese style (Emporeor) Grand Concert Pianos, the Xcelsior (Largest Grands) and the Xperior (Selected Grands), which all have quite differend but well known sound characteristics. There are at least 4 different base models available with each of the releases plus a set of 16 hybrid models, which are fusions of the base models and all are selectable with just a touch for any performance. So all in all, there are 20 different timbres for instant selection availble with each of our Concert Grands (in sum 20 different, unique base timbres and their 16 fusion models ( = 100 !!! ).

The JAX Concert Grands mainly were created for performing classical music of all decades and Jazz and also come with its own integrated MIDI player, which is able to perform real MIDI recordings with sample accurate timing precision. Hundereds of such live played performances are included for enjoyment and audition, covering all famous piano componists of the last centuries. Each model has its own selection of MIDI files for random playing.

We specifically optimized the user interface for usage on the iPhone and the iPad.The macOS versions are identical to the iOS versions and optimized for the big Mac displays.

This build is truly 'universal', meaning, unit is available for:

- MacOS (Catalyst)
- MacOS (Apple Silicon)
- iPadOS (iPads)
- iOS (iPhone)

The JAX Concert Grands feature different models of high quality virtual pianos.
JAX series releases are AudioUnits (AUv3). Audio units usually require a supporting host application for operation.
The main app also allows MIDI live connections for direct playing as a sound module.

## Key features

- Virtual grand piano sound module
- AUv3 compatible
- Optimized for mobile devices
- Advanced sound modeling
- Expressive velocity simulation
- Integrated MIDI player
- Cross-platform compatibility (macOS, iOS)


## Frequently asked questions about JAX Imperior Grand Piano

### What is JAX Imperior Grand Piano?

JAX Imperior Grand Piano is a virtual piano sound module and Audio Unit (AUv3) designed for Apple devices. It offers advanced sound modeling and expressivity, optimized for mobile use.

### What devices is JAX Imperior Grand Piano compatible with?

JAX Imperior Grand Piano is a universal app compatible with macOS (Catalyst and Apple Silicon), iPadOS, and iOS (iPhone). It also supports iPod.

### How much does JAX Imperior Grand Piano cost?

JAX Imperior Grand Piano is available for a one-time purchase price of $24.99. This price grants access to the cross-platform release for all Apple devices.

### Does JAX Imperior Grand Piano have ads?

No, JAX Imperior Grand Piano does not contain advertisements. It is a paid application with no in-app purchases or ads.

### What kind of piano sounds does JAX Imperior Grand Piano offer?

JAX Imperior Grand Piano features selected American-style piano models. It offers 20 different timbres, including base models and hybrid fusions, for instant selection.

### Can JAX Imperior Grand Piano play MIDI files?

Yes, JAX Imperior Grand Piano includes an integrated MIDI player capable of performing real MIDI recordings with sample-accurate timing precision. Hundreds of included performances are available.

### How frequently is JAX Imperior Grand Piano updated?

The latest version of JAX Imperior Grand Piano is 1.95, last updated on March 10, 2024. Updates are released periodically to improve functionality and add features.

### What is the age rating for JAX Imperior Grand Piano?

JAX Imperior Grand Piano has an age rating of 4+. This indicates it is suitable for users aged 4 and above.

## Version history (last 5 releases)

### 1.95 — 2024-03-10

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

### 1.94 — 2023-05-15

version 1.94 (build 2238)

- we re-synthesized all spectral models
- optimized synthesis parameter adjustments
- fixing samplerate issues with some collections
- polyphony performance optimizations
- availability of the JAX Xcelsior Concert Grand collection
- reduced price for limited time across all collections

more information about this release can be found at our support website at
https://midi.digitster.com

### 1.92 — 2023-03-25

version 1.92 (build 2188)
( decay, sound & compacting )

- Superior Base Model 1 was changed and moved to Base Model 4 from the Xperior collection
  Base Model 1 and 2 for Superior where exchanged
  the new selected Model 1 better expresses the characteristics of a fine tuned German Grand
  
- some ideas for more realism from pianist * Joseph Balson * were implemented into the sound engine
  all models got more random action and sound fuller with polyphony
  the general bass response was improved
  these adjustements apply to all base and fusion models across the collections

- we removed unneccessary data and compacted the distribution files again
  the app now takes (like before) much lower space on disk and distribution
  by keeping same functionality as before
  
- we slightly optimized the frequency response of all 20 models in the highest frequency ranges
  overly brghtness was limited 
  it is still possible to make the models bright with the 'brightenss' parameter
  
- we re-adjusted the main volume of the sound generation about -6dB
  the pianos were reported being much too loud, especially in comparison with others

- sound generators were reconfigured to provide more realisim
  with lower velocities the response was improved (softer attacks)
  
- the decay and sustaining was drastically re-adjusted to become more natural across the range
  lower tones get longer decays
  
- system dependent contrast corrections on the user interface colors were made

Please note, that the re-adjustments above will require to edit all your self-made presets.

### 1.9 — 2023-03-16

version 1.9 (build 2149)
( macOS audio unit fix )

- a problem whith activating the macOS audio units was identified and solved
  we re-tested with latest versions of Apples Logic Pro X and GarageBand
  and fixed (again) unspecific issues with the macOS auvaltool audio unit validation
  
- a potentilal problem for selecting the samplerate at unit initialization was identified and fixed
  the audio unit should support any samplerate correctly now

- the string resonance behaviour macro was re-adjusted again
  we plan to expose 2 new parameters for this with next updates

- external MIDI controllers can now adjust common parameters via MIDI control messages
  please note, that loaded MIDI files will not set encoded MIDI controllers on the user interface
  but may change the internal synth engines state.

ROADMAP version 2++:
( please note that version 2 features potentially depend on sales performance )

- improve and optimize the base models
- expose new parameters for string resonance, hammer noise and possibly others
- implement octave micro tuning and classical tuning tables
- add MIDI player key inverter (experimental)
- add factory library browser for selecting specific MIDI files
- display information about (randomly) loaded MIDI files
- (possibly) implement a MIDI session recorder
- (possibly) implement soft pedal to parameter connectivity
- (possibly) optional piano specific convolution reverb and dynamics

### 1.8 — 2023-03-11

No release notes.

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## More apps by Jens Guell

- [GM MIDI Player](https://appshunter.io/ios/app/gm-midi-player/id1445780869)
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- [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

[jax imperior grand piano](https://appshunter.io/ios/topics/jax-imperior-grand-piano)

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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 2026-06-20.*