This design has me very intrigued and really want to hear a demo of it..... Description: The worlds first and only reverb pedal to have a built-in expression roller and preset blend—the Amethyst is one of the most versatile reverb pedals ever built. EXPRESS YOURSELF The built-in roller allows you to adjust effect parameters in a live setting by simply rolling the wheel forward or backwards with your foot. The result is a fast and fun way to adjust your tone on the fly, without interrupting your playing. The FEEDBACK, REVERB, and PRESET parameters can be assigned to the roller using the expression toggle switch. The unselected parameters will continue to function as standard knobs. See the video below for a more detailed look on how this works! PRESET BLEND The Amethyst Reverb features a one-of-a-kind preset blend knob. With the turn of a knob (or roller!) it is possible for the user to smoothly sweep between two user defined presets. Each preset can be stored to recall tone, room, feedback, and reverb settings. CONTROLS EXP (toggle) - Selects which control is being articulated by the built-in expression roller. Toggle to the left to tie the roller to the FEEDBACK knob; toggle middle to control the REVERB knob; toggle to the right to control the one-of-a-kind PRESET blend. TONE - Controls the brightness of the reverb. ROOM - Simulates the effects of room size and the time it takes for reverb to occur naturally. FEEDBACK - Controls the amount of reverb that is feedback into the original signal. Note at upper extremes self-oscillation is possible. REVERB - Controls the amount of reverb or "wetness." BOOST (Push-button)- All reverbs can cause some perceived reduction in volume at more extreme "wet" settings. BOOST allows you to bump the signal to recover to a more robust volume level. PRESET -Create two unique user defined settings and blend smoothly between the two! Turn the knob all the way to the left for 100% Preset A, all the way to the right for 100% Preset B. turn the knob in between the two presets to achieve a blend of A and B. Turning the knob straight up represents a 50/50 blend of the two presets. SAVE (Push-button) - Saves setting when programming Preset A or Preset B. To save a preset start by turning the Preset knob to the desired Preset (A or B). Once in the programming range, simply turn the other 4 knobs until the sound you want to achieve has been found. Click the SAVE push-button. Three blinks indicates that your preset was saved successfully; one blink indicates an error in saving.