 This type of music came to be called "chiptunes" (referring to Amiga's chip memory, the part of memory that custom chips can access).Earliest examples of tracker chiptunes date back to 1989 and are attributed to the demoscene musicians 4mat, Baroque, TDK, Turtle and Duz.Tracker chiptunes are based on very short looped waveforms which are modulated by tracker effects such as arpeggio, vibrato, and portamento.