The Fundamental Reverb provides you with the core sounds of ambient effects. With three reverb algorithms, you can go from an ambient hall to an analogue spring emulation, as well as a bright plate emulation. Decay controls the amount of reverb decay time. Left is the minimum and right is the maximum amount of time. Feedback slider sets the amount of wet reverberated signal that is fed back into the signal. Mix slider sets the mix of the effect and the original clean signal. All the way to the left outputs only the fully clean signal, and all the way to the right outputs only the affected Reverb signal. The slide switch allows you to change between three distinct reverb algorithms: Hall: Emulates the large sounds of an acoustic hall, characterized by long decay times and a more diffused and spacious sound. Spring: Emulates the bouncy twang of the spring reverb commonly found in tube amps. Plate: Emulates a smooth analogue plate reverb, offering a denser, more focused reverberation of the signal. The Reverb comes with trails mode active by default, to disengage trails mode hold down the bypass stomp switch when applying power to the pedal. Once the LED flashes it indicates that trails mode is turned off. To re-engage trails mode, repeat the process, and wait for the LED to turn dark, indicating that trails mode is back on. With trails mode active, your delay repeats will fade off naturally after turning the pedal off. With trails mode inactive, the decay abruptly cuts off when you turn off the pedal. For the Fundamental Series, the team at Walrus Audio challenged themselves to design a set of pedals with the tonal integrity that's required to live on a professional's pedalboard, but with simplified controls friendly enough for even the newest effect pedal users. Each Fundamental pedal has three sliders for tweaking the sound and a three-way switch for changing pedal modes. The result is a line of pedals that will keep you covered from your first band practice all the way to a sold-out arena. Designed and assembled at Walrus Audio headquarters in Oklahoma City, USA.