A powerful command-line tool included with the official FLAC package. Use the --add-replay-gain command [19].
After applying the FLAC Gain Fix, verify: flac gain fix
Here is the most critical concept to understand: It does not compress, limit, or degrade your lossless file. Instead, it adds a mathematical metadata tag —a sticky note attached to the file—that says: "Play me 5 dB quieter than normal." A powerful command-line tool included with the official