The JVM410C has built-in, 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. Each of the 4 channels has the usual suspects when it comes to controls - Volume, Bass, Middle, Treble & Gain - accounting for 20 of the 28 controls right away. Take away the 4 reverb controls and you're only left with 4 Master controls - 2 master volumes plus Resonance and Presence.