2 s at 22050 Hz: silence + a 1 s 440 Hz burst carrying 4 clicks + silence
(burst edges exactly [11025, 33075]). Badges mirror
examples/node/effects.mjs: exact centered-frame trim/split
golden [10240, 34304] with enclosure, preemphasis→deemphasis round-trip,
exact time_stretch lengths with pitch preserved, pitch_shift +12 → 880 Hz,
waveform-level HPSS 440 Hz-bin dominance, and remix reversing the burst
halves (bit-exact at align_zeros: false). The waveform shows
the trim edges (gold) around the burst; buttons audition original vs
stretched vs shifted.