The Purple Audio ODD is a 4-band 500 Series EQ with discrete, transformer-coupled circuitry and incredibly smooth sound. Based on a classic "swinging inputs" console equalizer, the ODD features four bands of equalization with two selectable frequencies per band as well as switchable high-pass and low-pass filters. The outside bands can also be switched from bell to shelf curves which work wonderfully when used in conjunction with the filters. The ODD has a tremendous amount of headroom and has extremely low distortion even at full boost, making it an awesome tool for huge tonal shifts to make thin, papery sounds into thunderous tones.