I built music composition agent and browser-based DAW for Opus 4.5

Show HN: I built music composition agent and browser-based DAW for Opus 4.5

I built music composition agent and browser-based DAW for Opus 4.5 operates in show hn launch.

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I was interested in exploring how good Opus 4.5 has become at music composition, so I built a local-first browser-based DAW where you describe music and Claude composes it using an agentic loop with lots of tools (create tracks, write notes, read back what it wrote, apply swing, humanize timing, set panning/volume, etc.). It also supports recording via MIDI keyboard, looping, multi-track, panning, a bunch of synth instruments, all inspired by the Logic Pro UI, so you can collaborate with the AI.Opus 4.5 is pretty good at one-shotting MIDI compositions already, even without a custom harness and tool, but it really shines when you ask it to self-review (a Ralph Wiggum loop would help here!) an

Within the show hn launch space, the company focuses on its core offering rather than a broad product line.

Its current recorded stage is Show HN launch.

Website: www.usecadenza.studio