The most interesting feature is the power attenuator, which can be used to set the amp to 5W, 1W or 0.1W modes. In full-power mode (5W), power-amp saturation starts to make a significant contribution as you crank up the volume, but by this stage the amp is pretty loud! Switch to the 1W mode and you can push the power stage harder, and achieve a wealth of blues overdrive tones at a much more manageable level. The 0.1W mode brings saturated vintage-rock tones within reach, and despite the tiny power rating, it's more than loud enough for recording.