Additive synthesis:
Creating sound by adding together multiple sine waves. It is used in electronic music.
Distortion:
"Harmonic distortion adds overtones that are whole number multiples of a sound wave's frequencies.[1] Nonlinearities that give rise to amplitude distortion in audio systems are most often measured in terms of the harmonics (overtones) added to a pure sinewave fed to the system."
http://en.wikipedia.org/wiki/Distortion
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