# WU: AUHighPassFilter — High Pass Filter Audio Unit

> High-pass audio filter plugin for AUv3 compatible hosts. (iPhone/iPad app by Jens Guell.)

- Source: https://appshunter.io/ios/app/wu-auhighpassfilter/id1530887273 (this page in markdown: same URL + `.md`)
- Developer: [Jens Guell](https://appshunter.io/developer/1195004865)
- Category: Music, Utilities, Music
- Price: Free (on sale, was $3.99)
- Rating: 4.50/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 12.0 · 30 MB
- Languages: English
- Released: 2020-10-15
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/wu-auhighpassfilter/id1530887273/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

- High-pass filter effect
- AUv3 audio processing plugin
- User interface exposure
- Works with any AUv3 host
- Consistent sound across projects


## Frequently asked questions about WU

### What is WU: AUHighPassFilter?

WU: AUHighPassFilter is an audio effect plugin that functions as a high-pass filter. It is designed to work with any host application that supports AUv3 audio processing plugins, making professional audio effects accessible across different software.

### How does WU: AUHighPassFilter ensure consistent sound?

The plugin exposes the user interface of the system's Audio Unit, allowing for consistent application of the high-pass filter effect. This ensures that your audio processing sounds the same regardless of the host application you are using.

### Can I use WU: AUHighPassFilter with GarageBand?

Yes, WU: AUHighPassFilter is well-known from its use in GarageBand on macOS and iOS. You can use this effect with any host application that supports AUv3 audio processing plugins, including GarageBand.

### What devices is WU: AUHighPassFilter compatible with?

WU: AUHighPassFilter is compatible with iPhone, iPad, and iPod. It requires an age rating of 4+ and utilizes AUv3 audio processing plugins.

### How often is WU: AUHighPassFilter updated?

The application was last updated on March 12, 2024, with version 1.21. This indicates a relatively active development cycle, suggesting ongoing support and potential improvements.

### What is the user rating for WU: AUHighPassFilter?

WU: AUHighPassFilter has a rating of 4.5 stars based on 2 ratings. This suggests a generally positive reception from its current user base.

### Is WU: AUHighPassFilter free to use?

Yes, WU: AUHighPassFilter is available for free. There are no in-app purchases or subscription fees associated with using this audio effect plugin.

## 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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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.*