Show HN: Audio Player with "Binaural Beats" tuned to the same key as your music

A developer shared an open-source binaural beat generator on Hacker News. The audio player overlays two tones in your ears to induce specific mental states—focus, relaxation, meditation—and solves a frustration with existing tools: it keeps those binaural tones perfectly in tune with the music you're playing. It analyzes your track's key and tempo automatically, includes seven brainwave presets, harmonic mixing controls, adjustable frequencies, playlist support, and recording capability. The developer is refreshingly candid about the science: binaural beats' effects remain unclear—might be legitimate, might be placebo, probably somewhere in between. They find it genuinely useful for concentration and creative work. The whole thing runs directly in your browser with no installation required, and it's completely free.

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