The culmination of breakthrough DSP technology allows users to swap pre-amp tubes, power amp tubes, and even change the variac of the included amps. Team R2R | | WiN: 389.3MB | MAC: 520.7MB TH-U is the world's largest collection of models in a single software, boasting over 239 models of amps, cabinets, FX, and mics including officially authorized models of highly-prized manufacturers.