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USE flags

• aac - Enable support for MPEG-4 AAC Audio
• aiff - Enable support for Audio Interchange File Format (AIFF) output encoding
• cdr - Add support for CD writer hardware
• flac - Add support for FLAC: Free Lossless Audio Codec
• id3tag - Support ID3, ID3v2 tagging of audio files
• lame - Prefer using LAME libraries for MP3 encoding support
• mac - Enable support for Monkey's Audio files
• musepack - Enable support for the musepack audio codec
• musicbrainz - Lookup audio metadata using MusicBrainz community service (musicbrainz.org)
• normalize - Add support for normalizing audio file volume levels
• opus - Enable Opus audio codec support
• replaygain - Support for Replay Gain metadata, for relative volume adjustment
• speex - Add support for the speex audio codec (used for speech)
• vorbis - Add support for the OggVorbis audio codec
• wavpack - Add support for wavpack audio compression tools