In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. More than 30 years ago, TAPCO built a reputation for affordable, high-quality audio mixers and graphic equalizers at very musician-friendly prices. Today, we continue that tradition with the Tweeq T231, a dual 31-band graphic equalizer with exceptional construction, high-precision sliders, sensible features and great sound quality. So whether you're running live sound or enhancing an installed system, you can tweeq your sound with confidence.