Remove the AAC copy (audio_v1/); 48 kHz audio48k/ is the only audio

Card: show the two YouTube versions (Opus and AAC) at the top and where each lives in the repo

AudioSet v2: 48 kHz audio, per-clip provenance, measurements, duplicate flags and missing-segment reasons; first download kept under audio_v1/

Dataset card, Google label files, per-clip metadata with the shard map, noise-bank subset

Dataset card, Google label files, per-clip metadata with the shard map, noise-bank subset

Dataset card, Google label files, per-clip metadata with the shard map, noise-bank subset

Dataset card, Google label files, per-clip metadata with the shard map, noise-bank subset