Reverb is always available in Amp Designer, even when you are using a model that is based on an amplifier that provides no reverb function. Reverb is controlled by an On/Off switch and a Level knob in the middle. The Reverb pop-up menu is located above these controls. You can add Reverb to either the tremolo or vibrato effect, or you can use it independently.
On/Off switch: Turn the reverb effect on or off.
Reverb pop-up menu: Click the word REVERB to open the pop-up menu, then choose a reverb type. Options include Vintage Spring, Simple Spring, Mellow Spring, Bright Spring, Dark Spring, Resonant Spring, Boutique Spring, Sweet Reverb, Rich Reverb, and Warm Reverb. See Amp Designer reverb types for information on these reverb types.
Level knob: Set the amount of reverb applied to the preamplified signal.