TinyAudioUnitHost

💡 A tiny macOS app that hosts Audio Units and routes live audio input through them in real time.

🎛️ Pick any effect AU from the sidebar, route your mic or audio interface through it, and listen to the result. Useful for practicing — when you just need a piano to sing along to, or a single guitar amp sim, without firing up something heavy like Logic.

🧪 Built with AVAudioEngine, SwiftUI, and Swift 6 strict concurrency. Zero external dependencies — only Apple frameworks.

🎸 A small idea that I'll be growing over time. Let's see where it goes.

Getting Started

Prerequisites

Install mise if you don't have it yet. After installing, make sure to activate it in your shell.

Setup

mise run generate     # resolves dependencies and generates the Xcode project

Then open TinyAudioUnitHost.xcworkspace in Xcode and run.

Work in Progress

🚧 What's next:

1. Presets — save and restore AU state between launches.
2. Logging & error handling — replace the assert(status == noErr, ...) calls in CoreAudioGateway (and similar fail-fast spots) with structured logging and graceful recovery. Currently the app crashes in debug and silently misbehaves in release on CoreAudio failures.