The original sounds from the ST-xx disks can be downloaded from archive.org here:
https://archive.org/details/AmigaSoundtrackerSamplePacksst-xx
As detailed in the text and comments on this page, due to the up-sampling carried out during conversion to WAV format, the samples here need to be pitched down to get to their intended octave.
Additionally some of the samples inherit a click from stray file headers in the original Amiga sound formats, these can be easily trimmed off with a sound editing package.
Brief History
Trackers were basic sequencers that allowed the creation of musical patterns that could then be arranged and repeated to create full length tracks.
Tracker music could be heard in many of the 16-bit games of the late 80s and 90s as well as in demos which people created to show off their musical and software development skills.
Below is a video of some notable examples of demos:
Ultimate Soundtracker
One of the first and most famous trackers was Ultimate Soundtracker for the Commodore Amiga home computer created by Karsten Obarski in 1987. To accompany his tracker software Karsten created two floppy disks containing sampled sounds that could be sequenced using his tracker, these disks were called ST-01 and ST-02.
ST-01 and ST-02 were just the start with over 100 further sample disks being added to the library of ST-xx sound source disks.
The sounds on these disks became a staple for people using not only Karsten’s tracker but also the trackers that followed it and are synonymous with the sound of the games and demos of the time.