# WU: AUBandpassFilter — Band Pass Filter Audio Unit

> Audio Unit band-pass filter for music production across AUv3 hosts. (iPhone/iPad app by Jens Guell.)

- Source: https://appshunter.io/ios/app/wu-aubandpassfilter/id1530887377 (this page in markdown: same URL + `.md`)
- Developer: [Jens Guell](https://appshunter.io/developer/1195004865)
- Category: Music, Utilities
- Price: Free (on sale, was $3.99)
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 30 MB
- Languages: American English
- Released: 2020-10-15
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/wu-aubandpassfilter/id1530887377/reviews.md

## What is WU?

The WU (Wrapped Units) Series audio units exposes the user interface of the systems Audio Unit and makes it available to all host applications that support AUv3 audio processing plugins. Even if those hosts do not support UI-less units. Use the effect, well known from GarageBand on MacOS and iOS with any host application and ensure consistent sound with all your projects.

## Key features

- Band-pass filter effect
- AUv3 audio processing plugin
- User interface for Audio Units
- Compatible with all AUv3 hosts
- Consistent sound across projects


## Frequently asked questions about WU

### What is WU: AUBandpassFilter?

WU: AUBandpassFilter is an Audio Unit (AUv3) plugin that provides a band-pass filter effect. It allows users to apply this effect to their audio projects within any compatible host application on iOS devices.

### Is WU: AUBandpassFilter free to use?

Yes, WU: AUBandpassFilter is available for free. It does not require any payment to download or use its features.

### What devices does WU: AUBandpassFilter support?

WU: AUBandpassFilter is supported on iPhone, iPad, and iPod. It is designed to work with iOS devices.

### How often is WU: AUBandpassFilter updated?

The app was last updated on March 12, 2024, indicating active development and maintenance. This suggests users can expect ongoing support and potential improvements.

### What is the age rating for WU: AUBandpassFilter?

WU: AUBandpassFilter has an age rating of 4+. This means it is suitable for users of all ages.

### Does WU: AUBandpassFilter have ads?

The provided data does not indicate the presence of advertisements in WU: AUBandpassFilter. It is listed as free without any mention of ad support.

### What is the user feedback on WU: AUBandpassFilter?

WU: AUBandpassFilter has received excellent user feedback, with an average rating of 5.0 stars from 2 ratings. This suggests a high level of user satisfaction.

### Can I use WU: AUBandpassFilter with any music app?

WU: AUBandpassFilter is compatible with any host application that supports AUv3 audio processing plugins. This ensures broad usability across different music production software.

## Version history (last 3 releases)

### 1.21 — 2024-03-12

The project was updated for Apple's latest compilers and frameworks.

### 1.2 — 2021-02-01

WU Series Maintenance Update 1.2 (January 2021)

- fixed a multiple instances problem with the editors
- fixed a wrong icon assignment of the highpass filter unit
- fixed a parameter assignment bug, if the units define special addresses
- fixed possible adjustment of read-only parameters
  please note, that read-only parameters are still displayed with the interface
- added parameter min/max value validity checking
- re-adjusted finer control of the sliders
- added support for string values
- added support for labels for indxed parameters
- re-adjusted some label sizes and positions
- added fixed point formatting for floating point parameter values
- completely removed resizing control from the UI
- disabled gestures for resizing and positioning internal view
- reduced diagnostic printout during load
- removed MIDI assignment extension due to problems with some hosts,
  which send unwanted MIDI controllers and initializers to chained effects
- all WU units are now exposed a standard audio effects (aufx),
  effectively increasing the amount of hotsts supporting them
- please note, that any extensions to these units would
  make the aupreset format incompatible with the original
  and no longer share-able across platforms and hosts

- added the AUPitch shifter unit to the collection
  please note that the pitch shifter has one parameter,
  that is not intended for realtime use
- added the AUMIDISynthesizer to the collection
  this unit is a multitimbre multi MIDI channel sound module
  with a standard General MIDI compatible sound bank.
- added the AUSampler unit with a set of GM based presets
  please note that this release is a preview release for the
  capabilities of the sampler unit and its file format

### 1.0 — 2020-10-15

No release notes.

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## More apps by Jens Guell

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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 2026-06-10.*