The Marshall all-valve 4-channel JVM410H 100-Watt tube head is the most versatile Marshall amplifier and features more gain than any other Marshall.
Each of its 4 channels, Clean, Crunch, OD1 & OD2, are independent of each other and have three modes, all 12 of which are footswitchable and feature 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 amp has 28 controls and 8 LED switches on their front panels, they're simple to understand because of the logical layout. Each of the 4 channels has the usual controls, Volume, Bass, Middle, Treble & Gain, for 20 of the 28 controls. Take away the 4 reverb controls and you're only left with 4 Master controls, 2 Master Volumes plus Resonance & Presence.