Overdrive

The overdrive pedal effect gives a boost or pressure (bost) that will push the amplifier to produce distortion.
overdrive one of the most delicate effects, its sound simulates the sound of the amplifier tube when the sound turns to hard.

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This is likely the guitar player to get a longer pitch sound, an overdrive pedal effect is a very easy way to switch between the sounds very quickly, using the on and off buttons between overdrive sound and clean sound. overdrive is widely used by rock, blues and pop musicians.