 The usual method to emulate it is via quick arpeggios, which is one of the most relevant features of chiptune music (along, of course, with its electronic timbres).Some older systems featured a simple beeper as their only sound output, as the original ZX Spectrum and IBM PC; despite this, many skilled programmers were able to produce unexpectedly rich music with this bare hardware, where the sound is fully generated by the system's CPU by direct control of the beeper.The earliest precursors to chip music can be found in the early history of computer music.