Audio Unit (au) Jun 2026

If you are a Logic user, AU is the only choice that matters. Logic does not support VST3 natively; it demands Audio Units. This exclusivity forces developers to prioritize the AU format, meaning Logic users often get the most stable, bug-free versions of third-party plugins. The integration is seamless—AU plugins handle MIDI routing and side-chaining with a level of polish that often feels clunky in other formats.

Example (check Apple’s AUReverb2):

Audio Units are categorized based on what they do to the signal: audio unit (au)

AU allows you to save "AUPreset" files. These can often be shared across different DAWs on the same machine. You could theoretically save a preset in GarageBand and open that same processing chain in Logic Pro. 3. The iOS Ecosystem

But what exactly is an Audio Unit, and why does it matter to your workflow? Let’s dive into the architecture, benefits, and practical use of this essential technology. What is an Audio Unit (AU)? If you are a Logic user, AU is the only choice that matters

| Aspect | Details | |--------|---------| | | Apple’s native audio plugin | | Platforms | macOS, iOS, iPadOS | | Latency | Ultra-low (real-time safe) | | Main types | Effect, Instrument, Generator, Mixer | | Latest version | AUv3 (since iOS 9 / macOS 10.11) | | Development | Xcode, C/C++, Core Audio | | Validation | auval command | | Common hosts | Logic Pro, GarageBand, REAPER, Ableton Live, MainStage, AUM |

| Type | Description | Examples | |------|-------------|----------| | | Process incoming audio (in-place) | Reverb, Delay, Chorus, EQ, Distortion | | Instrument | Generate audio (no input) | Synthesizer, Sampler, Drum machine | | Generator | Produce audio (non-MIDI) | Tone generator, Noise generator | | Mixer | Combine multiple audio streams | Stereo mixer, Surround panner | | Panner | Spatial positioning | 3D panner, Surround panner | | Offline Effect | Non-real-time processing (e.g., file analysis) | Loudness meter, Audio editor | | Format Converter | Change sample rate / bit depth (rarely used directly) | Sample rate converter | The integration is seamless—AU plugins handle MIDI routing

The transition to AUv3 has revolutionized mobile music production. You can now use the same high-end plugins on your iPad that you use on your MacBook, allowing for a seamless "on-the-go" to "studio" workflow. How to Install and Use Audio Units Most AU plugins come with an installer.