rekordbox Auto Gain Levels Tracks in Software but Not in Exported Files

rekordbox's Auto Gain feature balances track levels during playback on its own decks, but the calculated value is never saved into the audio file. As a result, a CDJ reading a USB stick does not apply the same leveling and tracks can play at different volumes. The author measured six tracks and found Auto Gain roughly targets -10 LUFS, though rekordbox does not document this target. Because a file cannot exceed 0 dBFS, loudness matching cannot be written into it without a limiter, so the author built a tool that instead sets a single -0.5 dBTP true peak ceiling per track. This approach changes only the gain without limiting dynamics, but it does not equalize perceived loudness between heavily compressed and dynamic masters.