In a nutshell, the Marshall all-valve, 4-channel JVM410H 100-Watt tube head is the most versatile Marshall amplifier ever made. It also boasts more gain than any other Marshall to date-and that's really saying something!Each of its 4 channels-Clean, Crunch, OD1 & OD2 ? are not only completely independent of each other, they all boast 3 Modes, all 12 of which are footswitchable and feature their own unique gain structure. It makes the JVM 4-channel effectively 12 Marshalls in one!The JVM410H has studio-quality digital reverb with a level control for each channel. This is also footswitchable, as are the amp's two Master Volume controls and the Series/Parallel effects loop. Resonance and Presence are equipped with master controls.Even though the head and combo both house 28 controls and 8 LED switches on their front panels, they're incredibly simple to understand because of the extremely logical layout.