Gain Fix: Flac

FLAC preserves original PCM audio data losslessly, but it does not inherently enforce uniform loudness. Without normalization, users experience volume jumps between tracks or albums. The FLAC Gain Fix solves this by writing ReplayGain tags (e.g., REPLAYGAIN_TRACK_GAIN, REPLAYGAIN_ALBUM_GAIN) into the file’s metadata. Unlike destructive audio normalization, ReplayGain is non‑destructive and reversible.

FLAC stores ReplayGain values in Vorbis comments. The relevant keys are: flac gain fix

ReplayGain analyzes audio to measure perceived loudness (in dB relative to a reference level of 89 dB SPL) and computes: FLAC preserves original PCM audio data losslessly, but