In the words of Old Blood Noise Endeavors:

Actively contending with the existential construct of time, Old Blood Noise Endeavors presents the BL-44 Reverse Variable Clock effector, a reverse effect that allows the user to change the clock speed of the entire sonic system. Through a simple control set, sounds ranging anywhere from lively harmony to faded memory can be achieved. The BL-44 is a true reverse effect, always reading backward what the player has most recently played, but with added depth and harmony from the interaction of the Clock slider and Speed knob. It aims for an immediate and tactile experience that encourages the player to keep their thumb on the slider and experiment.