# JAX MASTERING : MBC Pro — (AudioUnit) 5Band Compander

> (AudioUnit) 5Band Compander (iPhone/iPad app by Jens Guell.)

- Source: https://appshunter.io/ios/app/jax-mastering-mbc-pro/id1619272047 (this page in markdown: same URL + `.md`)
- Developer: [Jens Guell](https://appshunter.io/developer/1195004865)
- Category: Music, Productivity
- Price: $9.99 (on sale, was $14.99)
- Age rating: 4+
- Requires: iOS 12.0 · 78 MB
- Languages: English
- Released: 2024-06-09
- Data updated: 2026-06-21
- User reviews in markdown: https://appshunter.io/ios/app/jax-mastering-mbc-pro/id1619272047/reviews.md

## What is JAX MASTERING?

Please note, that AudioUnits (AUv3) require a supporting host application to perform.

The MBC Pro is a multi band / master bus audio processor (companders), suitable for mastering. Parallel analog modeled filters split the audio stream into 5 freely adjustable bands, on which the 5 dynamic processors will perform action in parallel - each wit its own set of parameters - or linked together. Input and output is stereo, parallel processing for each frequency band (mix with the original) is possible. The effect processors now have zero latency.

A PDF manual is included with the app : https://audio.digitster.com/wp-content/uploads/2024/04/JAX-MASTERING-MBC-Pro.pdf

This app is truly 'universal', meaning, unit is available for:
- MacOS (Silicon)
- iOS (iPhone)
- iPadOS (iPads)
- visionOS (Apple Vision Pro)


## Version history (last 2 releases)

### 2.5 — 2026-06-18

- demo host appearance modernized
- updated to latest framework changes

- the user interface now opens automatically in the demo host
- main color adjusted (still can be edited with AU parameters)
- added a set of 512 new audio files for demo host

- default parameters adjusted to give instant pressure
- some minor corrections for DSP initializations
- exchanged the optional final limiter DSP
- the audio unit operates now with zero latency

### 2.4 — 2024-06-09

No release notes.

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## 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

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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 2026-06-21.*