I know this is kind of a newbie thing to ask, but I only have a general idea of what Headroom is and I'd like to get a fuller understanding. So far I think its the ammount of signal an amp can take without clipping or distorting, but I'm not sure. Take my Eden head for example...it has a Gain control and a Master control. Is Gain equivalent to "level" and Master equivalent to "send"? Should I crank the Gain to get more "headroom" and control how much the amp is getting with the Master? Just not sure. Thanks guys!