Logjam Music has added the Prolog and Travelog to its line of Logarhythms percussive stompers. The devices respond to foot tapping and produce a low-end tone that can be varied by tapping on different areas of their chambered block while wearing hard- or soft-soled footwear. Hand-made, they are analog, purely passive, and made of sapele. Their sound is transmitted via a dynamic microphone to amplification such as a guitar combo, PA, or recording desk via its a standard ¼” Neutrik output jack. They have a non-slip base that isolates floor vibrations. Learn more at www.logjam.net.