was introduced for the files that were created using ST-128K. The 1.x Soundtrakkers
are unable to read the .128 tunes, while ST-128K is still able to read the .sng files.
Under some circumstances ST-128K is not compatible with ST-1.x tunes. When using very short patterns in an ST-1.x song, the song can be messed up in ST-128K.