Distortion: Distortion technically is anytime the input signal differs from the output signal. The distortion effect was created to replicate the sound of a heavily distorted amplifier. Distortion sound was created by increasing the gain of the amplifier and guitarist have called it a “fuzzy”, “growling”, or “dirty” tone. The main difference between distortion and overdrive is that overdrive increases with increased volume and pic pressure, while the amount of distortion remains the same with volume, just gets louder.
Simplest Definition: Sounds dirty.
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