Load a click track, find its beats, and hear the result: this page runs
pleco-xa's quickstart beat detection, marks every detected beat on the
waveform below, and lets you play the audio with a click overlaid on each
one. Under the hood, the pinned click120 fixture signal from
tempo_beats.json goes through a 16-bit WAV encode/decode, then
beat_track — tempo and beat frames must EXACTLY equal the
reference fixture values (bit-exact), identical to
examples/node/tutorial.mjs. Advanced half:
effects.hpss → beat_track(percussive) → feature.mfcc + delta,
beat-synchronously aggregated.