The Catalinbread Semaphore is a versatile tremolo pedal delivering classic sounds from smooth, buttery warbles to hard-chopping repeats. It features intuitive controls for Volume, Rate, Depth, and Shape, with a switch for wave shape, offering tonal variations from clean boost to mild drive, and a volume boost option. Designed to avoid the volume drop often associated with tremolos, it maintains the original tone and can operate on 9v or 18v power.