I just got the GTX50. Before buying I watched a ton of video reviews, etc. Nobody mentioned something that seems an obvious problem. That is: There are big differences in loudness between presets. For example: I'm playing with preset one, which is a Twin. So I set the volume knobs on the amp where I want them. Then, when I switch to preset two, it is MUCH louder. This seems insane. Does this mean I have to go into each preset individually and modify the volume settings before I can use this amp? Why isn't everything defaulted to the same output level? Anybody else have this issue? THANKS. Steve