The Crazy Tube Circuits - White Whale Reverb/Trem is an all analog reverb and tremolo unit. The 3-spring tank provides lush reverb provides a handful of different reverb tones that behave just like you would want with an analog unit. Stomp, toss, knock, tap sounds that translate to the springs for eerie sounds, or just listen to the different tones you can get from different registers on the guitar; what you play before really matters in what happens next, and that's a near impossible variable to retain in a digital unit. Two separate expression pedal options are great for controlling reverb mix and tremolo speed. The tremolo options round out all the excellent surf tones one could imagine. In a small analog package, there really isn't anything that sounds this great at this price and size right now.