hey well i was looking at the epiphone galaxy and valve amps... those $200 5 watt ones... well it says it has a knob for gain, but people say it has no distrtion... now i thought gain and distortion were the same thing... whats the diffrence? and will a distortion pedal help? cause my friend has one and it sounds the same on my crappy 15 watt amp and his 1200 watt mixer with speakers...