What is MP3 & SHN?
MPEG Layer 3 (MP3) and Shorten (SHN) are methods of audio compression to allow music to be downloaded over the Internet and burnt to CD. MP3 is a lousy compression that throws away data during the compression process. This results in a file that is lower quality than the original. This is why CDs made from MP3s should be clearly marked and not put into mass circulation. Shorten is a lossless type of compression similar to zip in which when the file is decompressed you end up with an exact copy of the original wav – there is no reduction in sound quality.