Digital brick based analog circuit effect. VERB to set the amount of reverb (dry / wet) with the original signal), TONE - sets the bright / dark character of the reverb. the brighter the wet signal is - the more presence the string picking will bold out through the reverb. FEEDBACK - allows the length of the brick to exceed it's limit. Depending on which reverb brick was chosen - the reverb signal will be sent again to the circuit and create a cloud of reverb. The bricks are rated S - short decay (2 Sec.), M - Medium decay (2,5 Sec.) and L - long decay (2,8 Sec.) The longer the decay time of the reverb brick - the more the reverb's modulation would be felt (slightly like in chorus effect)