Far more than a piece of modeling gear, the Positive Grid BIAS Guitar/Bass Head gives you tools like premium op-amps, beefy Class D technology, and formidable Amp Match technology to craft the amp tone of your dreams. Amp Match technology collates thousands of painstakingly made digital samples of tube types, transformers, preamps, cabs, and more to be adjusted to your particular flavor. The result is a spectrum of sound that takes you from chimey British clean to fat brown sound to unrelenting metal tones. You could spend a lifetime just mixing and maxing.