Speaking of the Big Muff, the tone knob is too effective and can sometimes make it difficult to create the right sound. The Blue-Violet Caprid Small Foot produces a satisfying muff sound at any setting. Turning the tone knob counterclockwise brings out the richness of the guitar, creating a high-pitched, grungy tone. The harsh top end is nicely toned down, a testament to the excellent tuning. Conversely, turning the tone knob clockwise will also produce the characteristic mid-range tone characteristic of the Muff, resulting in a beautiful, long sustain. The Wren and Cuff Blue-Violet Caprid Small Foot is an even more compact version of the special edition Caprid, which has received rave reviews and praise worldwide. This pedal is a full-size reproduction of the legendary fuzz pedal known as the Ram's Head, which was released in the 70s. This limited edition model focuses on the earliest Ram's Head, known as the Violet, and is made using rare parts, including a 1973 gold-leg transistor. This reproduces the tone of a rare blue-printed Ram's Head, a rare variety among the Violet Ram's Heads. The sound is focused on the low-mid range, creating a tone with a slightly unbalanced feel typical of vintage pedals, like when you've finally managed to find a vintage pedal and are lucky enough to get your hands on one. It's a true Muff sound, with rich violin-like sustain and a slightly aggressive edge. ●Control VOLUME: Adjusts the volume. TONE: Adjusts the tone. Turning counterclockwise emphasizes the high frequencies. SUSTAIN: Adjusts the strength of the distortion. The Blue-Violet Caprid Small Foot is powered by a standard DC9V center negative adapter or a 9V battery.