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Acid

'Acid' is a sound typically produced by playing a repeating note pattern on the Roland TB-303 (or imitations of the 303), while altering the filter's cutoff frequency, resonance, and envelope modulation. The TB-303's accent control modifies a note's volume, filter resonance, and envelope modulation, allowing further variations in timbre. A distortion effect, either by using a guitar effects pedal or overdriving the input of an audio mixer, is commonly used to give the TB-303 a denser, noisier timbre--as the resulting sound is much richer in harmonics.