PomataL6

Hello everybody! I hae two problems, really: the first is that I downloaded this preset http://line6.com/customtone/tone/225077/, and when I try to change a parameter of the amp, let's say the gain, the knobs doesn't move. The other is this: when I'am editing my present on the computer ¿how can I turn on or turn off the distortion of the amp that I chose? ¿There is something like the gain button you find on amps or something? Thanks!