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