- Duration: ±15% (min 15s) instead of -40%/+50% - Variant filter: reject sped/speedup/slowed/reverb/nightcore/karaoke/ parody/remix/cover/acoustic/instrumental unless original title has keyword - Cascade: YTM+YT tried at each level (dur+artist+variant → no artist → no dur → no filter) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>