Thanks for the details, and also for the link! I was an Amiga owner/fan in the 1990s, but I'm not that into retrocomputing, so my info is a bit incomplete. Looks like there was a lot of in-house/not widely available software back in the day which was "kind of like SoundTracker, but not quite" - for instance I looked up another old favourite of mine (Lionheart) and found out that the music was composed with a tool called "Sonic Arranger" - the screenshots look familiar, but it looks like it also supported "synthesized" instruments, not only samples.