Tone - Adjusts the tone of the reverb. CCW for a darker reverb trail, CW for a brighter reverb trail. Level - Adjusts the output level of the reverb. Decay - Adjusts the length of the reverb trail. CCW for less decay, CW for more decay. Modulation - Adjusts the amount of modulation in the reverb trail. Mode Switch - This switch toggles between reverb modes: Nocturne, Spring, Plate