As handy as it is, MP3 has some serious problems built-in. Because of the erratic start and stop times, you can’t make an MP3 loop, either. The beginnings and ends are never going to reliably line up.
MP3 gets its small, convenient files by re-arranging sound and musical tones and throwing some of them out. If you make an MP3 from an MP3, it throws out even more tones. Never do production in MP3.
MP3’s full family name is MPEG-1, Layer 3. It’s part of a video format. It was always intended to depend on its associated video channel for sync.
Still, not bad for an audio format cranking along since 1993.
Koz