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One more thing — if your audio files are WAV (or any other non-lossy format), it is safe to do whatever you want in Audacity or similar program. Just keep a backup of the original file. If you are dealing with MP3 (which is a lossy format), Audacity will convert it to WAV upon loading. This involves a degradation of the original MP3 audio data. When you “export” from Audacity as an MP3 again, you get more degradation. Depending on several factors, you may or may not hear any difference. However, it is best to never convert MP3 to anything else, if you can avoid it.