Modulated reverb with Hall, Plate, Low-Fi, and Sonar voicings. Controls for Decay, Dampen (tone), Mix, and Variable "X" that depends on the voicing chosen. Sets pre-delay for Hall and Plate, EQ filter for Low-Fi - super cool AM radio vibe in there, and octave blend between down and up one. Switch to set modulation level at low, med, or high. Bypass switch for on/off and momentary latching Sustain switch for, you guessed it, sustaining the reverb trail. One of the knobs has been replaced because of a stripped screw - no damage to the pot itself. Velcro on the backside too. This is why I'm listing as "Good".