Observed arrival · 2026-09-03
tabmidi routes MIDI between browser tabs
An open protocol and browser extension for connecting web-based sequencers, synthesizers, keyboards, and other music apps without drivers or native software.
Field notes
The site documents a small message protocol built around window.postMessage rather than native MIDI drivers. Applications send arrays such as [0x90, 60, 127], and the extension forwards them to other open tabs; receiving code decodes status bytes into message types and channels. The examples include a Tone.js FM synthesizer with adjustable synthesis parameters and a keyboard with eight assignable knobs, while GitHub links expose the extension and instrument implementations.
Observed signals
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Editorial observations of this landing page, not a rating.
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