# WU: AULowPassFilter — Low Pass Filter Audio Unit

> AUv3 audio unit for low-pass filtering with a user interface. (iPhone/iPad app by Jens Guell.)

- Source: https://appshunter.io/ios/app/wu-aulowpassfilter/id1530887340 (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: 4.00/5 from 4 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-aulowpassfilter/id1530887340/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

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


## Frequently asked questions about WU

### What is WU: AULowPassFilter used for?

WU: AULowPassFilter is an audio unit that provides a user interface for a low-pass filter. It allows you to use this effect within any host application that supports AUv3 audio processing plugins.

### Is WU: AULowPassFilter compatible with all devices?

Yes, WU: AULowPassFilter is supported on iPhone, iPad, and iPod. It is designed to work across Apple's mobile and portable devices.

### How often is WU: AULowPassFilter updated?

The app was last updated on March 12, 2024, with version 1.21. This indicates a commitment to ongoing maintenance and potential feature additions.

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

WU: AULowPassFilter has an age rating of 4+. This suggests it is suitable for a wide audience and does not contain mature content.

### Can I use WU: AULowPassFilter offline?

As an audio unit, its functionality is dependent on the host application. Typically, audio processing plugins like this can be used offline within your DAW, provided the DAW itself supports offline operation.

### Does WU: AULowPassFilter offer different filter types?

The description specifically mentions a 'low pass filter'. While it ensures consistent sound, it does not detail the availability of other filter types like high-pass or band-pass.

### What is the user sentiment for WU: AULowPassFilter?

Based on the available data, WU: AULowPassFilter has a rating of 4.0 stars from 4 ratings. This indicates generally positive user reception.

### Does WU: AULowPassFilter have ads?

The provided data does not indicate the presence of advertisements in WU: AULowPassFilter. It is listed as free with no mention of ads.

## 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.*