A lot of trackers work with synthesized sound, even some early trackers were synth-only. Modern ones have improved on this, eg. Sunvox, Buzz and others are most

A lot of trackers work with synthesized sound, even some early trackers were synth-only. Modern ones have improved on this, eg. Sunvox, Buzz and others are mostly defined by their synths and effects, and how well those things integrate with the tracker interface.