Writes the standard ITUNESADVISORY tag — the same one Apple Music/iTunes
and Subsonic-compatible clients (Feishin, Symfonium, etc.) read to show the "E" badge.
Tap-to-Timestamp Sync
Press Space (when not typing) to stamp the "next" line and advance.
Click any line's time badge to stamp/re-tap it directly, or (when sync is off) to seek playback there.