How to convert .mp1 audio to .mp3 format.
Converting MPEG-1 Layer 1 Audio Files directly to MP3 Audio Files (.mp1 to .mp3 conversion) is possible and should be quite straightforward.
Use an audio editing software or (online) conversion tool, such as Awave Studio or Tiny Audio Converter, which allow users to import MP1 files and export them in MP3 format.
Audio editting software with huge format support
Audio converter for Mac