"Noise Tracker GS 1.x" is an Apple IIgs tracker created by Olivier Goguel around 1991.
The file naming is sometimes similar to the one used by SoundSmith files. (Respective 
files can be recognized by the file magic “FTA SOUNDFILE”, “FTA MUSICFILE”, 
“FTA MODULEFILE” inside the files.)

There is a successor format "Noise Tracker GS 2.x" incompatible with the old version.