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

Hi HN, Gabriel here. This is a standalone binaural beat generator, combined with a two-deck local audio player built with the Web Audio API. It includes ten harmonic carrier pairs, seven brainwave-state presets, per-harmonic mixing (so the binaural tones aren't out-of-tune with the music), adjustable beat and carrier frequencies, two oscillator shapes, offline key/BPM analysis, automatic carrier matching, adaptive impulse noise, playlist support, and output recording. The main problem I've had with existing "binaural beat" generators is that the tone generated does not remain in-tune with what I'm listening to. This becomes highly noticeable, kind of ruining both the binaural beat and the music ("wrong, Marge, two perfectly good jackets!"). That's the issue this solves, and then I added a bunch of nice-to-haves on top. It's open-source, free, etc - I'm just sharing because it's something I wanted to exist, and maybe others want it to exist too. Some of you might remember i-Doser , and have - like me - been looking for that same high ever since. That (urban-legend-coded, totally-trippy-if-you're-fifteen-years-old) app introduced me to "Binaural Beats" - where you play two different tones in each of a person's ears, and the brain scrambles the different frequencies into a single frequency. As I understand it, this is meant to induce specific brainwaves in the listener, which replicate states like "deep focus" or "half-asleep" or "meditating". I've not decided personally if this is real science, or new-age pseudoscientific nonsense. It's probably somewhere between the two. I intentionally haven't looked that hard into studies on the actual effects, because I think placebo is very powerful, and binaural beats work great on me. I find them genuinely useful for focus, meditation, and dream-state creativity. I figure: If it ain't broke, don't learn that it's a placebo. YMMV. I really love ambient music, and I think that audiobooks could be a much more interesting form if t