As different guitars have different amount of output volume, your guitar may cause a little less or more drive than needed. Use the "Effect" slider to set the amount of drive that sounds the best for you.
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If you feel like there is not enough drive, just increase the value of the "Effect". Move the slider to the right to create a more overloaded sound.
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If there's too much drive, reduce the value of the "Effect". You will get the cleanest sound in the far-left position.