About
Built by a musician, for musicians.
Sirius Looper is the work of Larry Seyer — recording engineer, producer, and software architect. It exists because the loopers Larry wanted to use as a performer did not exist, and the ones that did exist quantized away the feel he was trying to capture.
Why this exists
Every performance looper on the market assumes you press Record on the downbeat and stop on the downbeat after. Real music doesn't work that way. The phrase you wanted to keep started a half-bar before you decided to keep it. The take you wished you had captured was the one before the one you remembered to mark. Sirius Looper is built on the assumption that the tape was always running — because conceptually, it always should have been.
Sister project: OTTO
OTTO is a drum machine and groove engine, also by Larry Seyer. The two apps share the same audio architecture, the same look-and-feel system, and identical licensing terms. They are designed to be used together and ship in coordinated releases, but they are sold separately. The Sirius Looper distribution bundles a curated selection from the Larry Seyer Acoustic Drum Library; the full library ships with OTTO.
License
Source code is released under the GNU Affero General Public License v3, with an Apple App Store distribution exception and a sample-library exclusion. Bundled audio content (the drum library) is proprietary and separately licensed. The licensing model is identical to OTTO.
Status
Sirius Looper is at v0.1.0 and under active development. macOS builds are the current focus; Windows and Linux are in scope and will follow. No release date is announced. Add your email below and we'll let you know when there is something to try.
Contact
Issues, design notes, and pull requests are welcome on GitHub. For everything else, the mailing list is the path forward — sign up below.