My 'for big gigs' head is one of these, I struggle with a basic eq at the best of times so I can get myself in a right mess with this, in fact I can mess up the FET channel along the top row, then mess up the valve channel across the bottom before messing up the global EQ for the main output section on the right, that's before you start pushing in the extra buttons! There's just as many things to mess with on the back panel if you do finally master the front, lol.