The song S.O.S. from 1992 to 2005 versions.

Analysis of the spectrum of the song:

Original version (On the ABBA CD 1992)

Remastered 1994 (On Thank You For The Music Box and ABBA Gold Remastered 1992)

Remastered 24 bits 1997 (on the  ABBA CD 1997, ABBA GOLD 1999 y ABBA CD 2001)

Remastered 2005 (on The Complete Studio Recordings Box)

S. O. S. Revision Remix