Logjam makes compact acoustic percussion stompboxes that turn a player’s foot into a mechanical trigger for a kick-like pulse. The MicroLog, Travelog, Logarhythm and Prolog are not guitar effects: they are performance tools for adding low-frequency rhythm while playing another instrument. The practical details are the contact surface, mounting method, output level, playing feel and how the box responds to different footwear and floors. Logjam belongs in a percussion/utility context, but its foot-controlled format explains why it appears beside pedalboard gear.