ShoopDaLoop — Limitless Looping

ShoopDaLoop is a playful cross-platform live-looping application for audio and MIDI. It organizes loops into a track grid and supports free-form jamming, controller-driven workflows, and prepared performances.

Releases before 1.0 remain development releases: I wouldn't recommend relying on them in a performance, but if you do, test thoroughly beforehand.

User and developer documentation is published from this repository.

Current features

• Run on any major OS and in the browser - check the latest web self-contained web development build by just opening it in your browser!
• Audio and MIDI loops grouped in track columns which share input/output ports.
• A sync loop controls synchronization. Others are multiples of its length.
• Record/play MIDI and/or audio live, through FX/synth racks if desired.
• For tracks with FX/synth racks, you can re-play recorded content through the synth/FX live and e.g. adjust parameters or switch instruments on-the-fly.
• FX/synth options include built-in Carla plugin host integration, externally routed (e.g. external JACK apps/equipment), or a built-in demonstration mini-suite of (bad) synths and effects.
• Audio drivers on desktop are multi-platform based on CPAL + midir, or a dedicated JACK driver for advanced port routing.
• Web Audio/AudioWorklet and Web MIDI in supported browsers.
• Session load/save plus loop audio/MIDI import and export.
• Generated audio or MIDI click tracks.
• Embedded Lua scripting for control. Built-in scripts for keyboard control and APC Mini controller.

Screenshot

Run from source

# Native application with native FX support.
cargo run -p shoopdaloop

# Native application without Carla hosting.
cargo run -p shoopdaloop --no-default-features

For browser development:

rustup target add wasm32-unknown-unknown
cargo install --locked trunk --version 0.21.14
cd src/rust/shoopdaloop
trunk serve --open

See INSTALL.md for prerequisites and artifact details. The application-specific technical README documents settings, drivers, browser permissions, files, CI, and verification workflows.

Builds and platforms

The main workflow builds Linux x86_64, Windows x86_64, macOS arm64, and WebAssembly in debug and release. Native outputs are unsigned application archives. Web outputs include a hosted bundle and a self-contained HTML file. Browser media and MIDI access depend on browser support, permissions, secure-context policy, and device availability.

License and credits

Copyright © Sander Vocke (2023–present) and other credited contributors. See LICENSE.

ShoopDaLoop is made possible by Rust, egui/eframe, JACK, CPAL, midir, libsndfile-compatible tooling, Carla, omniLua, Tracy, and many other open-source projects represented in Cargo.lock. Native archives include the pinned GPL-2.0-or-later Carla runtime and its corresponding-source information.