Free Open-Source Sirial Plugin Brings Rhythmic Delay to All Major Platforms

Tiagolr, the developer known as Tilr on community forums, released Sirial yesterday, a free rhythmic delay plugin that replaces conventional multi-tap delay architecture with serial delay lines, a technical choice that separates it from virtually every other free delay in this space.

The distinction matters sonically. Where traditional multi-tap delays stack discrete repeats, Sirial routes signal through serial delay lines, which produces what Rekkerd describes as "the versatility of multi-tap delays with the natural decay (optional) and coloring of standard delays, producing a more pleasant and realistic sound." The inspiration is Soundtoys' EchoBoy, specifically its tape and tap modes, though Tiagolr's implementation takes the architecture in a different direction entirely.

Per-tap control is where Sirial earns its "rhythmic" label. Each tap can be positioned independently and configured with its own amplitude and feedback level. Crucially, effects can be applied on the feedback path of each individual tap, the same way you'd process feedback on a conventional delay unit. As the developer's release text puts it: "Sirial is a Rhythmic Delay where each tap can be placed and configured with different amplitudes and feedback giving total control on how the delay responds and the patterns it creates."

Sirial runs as VST3, AU, and LV2 on macOS with native Apple Silicon and Intel builds, Linux, and Windows. It is open-source under the GPL-3.0 license, with downloads and source code available on GitHub.

This is not Tiagolr's first entry in the free plugin space. The developer previously released RipplerX, a synthesizer, and QDelay, which SynthAnatomy called "beautiful, lush." The pace of releases has made Tiagolr a notable presence in the open-source plugin scene, arriving at a moment when, as SynthAnatomy noted, "the market for open-source plugins has grown significantly in the last two years."

For producers who have spent time with EchoBoy's tap mode and wondered what a deeper, more configurable version of that rhythmic decay architecture might look like, Sirial offers a GPL-licensed answer with no cost attached.