Audio equalizers are important tools for adjusting the gains of various frequencies in an audio sample so that the sound output is more desirable. Typically, they are used to help offset unique differences in the frequency responses of speakers in order to more accurately replicate the original sound that was recorded. This report describes the design and implementation of a parametric equalizer, a device that an important additional benefit over conventional equalizers: it allows the user to construct an audio filter of nearly any shape.