Audio All audio edits performed within Metro are of a nondestructive nature, in other words, a new audio file is created during each audio process. AIFF files containing the processed audio data are created in the same folder as the Metro document file. Metro’s built-in file management capabilities handle the tracking of all audio files originated by Metro edit operations, files that have been replaced or deleted from a Metro session are automatically deleted from your hard drive. For example, Normalizing a region that has been previously Reversed automatically deletes the Reversed audio file (since it has been replaced by the new Normalized file). Normalize Group Normalize Reverse Scale Amplitude Fade Cross-Fade Split Stereo Tracks Combine Regions