Soundtrakker 1.x and Soundtrakker 128 are different in more aspects than just the
amount of memory that is available. ST128 is a improvement of ST1.x, introducing
for example additional effects. That's why a new extension (.128 instead of .stsng)
was introduced for the files that were created using ST128. The 1.x Soundtrakkers
are unable to read the .128 tunes, while ST128 is still able to read the .st sng files.