an acoustic transport member for use in a keyboard having key operated strikers individually actuatable for inducing acoustic energy in the form of sound waves which propagate through the member from selected inducing positions therealong . a first portion of the member is fabricated to provide discrete impact positions for generating sound waves in response to impact actuation of related strikers . a second portion integrally connected with the first portion links all impact positions for receiving and transporting all sound waves generated by the first portion . a step joins the first with the second portions to allow communication of the sound waves from the first portion into the second portion yet thereafter provides unidirectional acoustic separation therebetween which effectively minimizes wave dispersion by substantially isolating the propagating sound waves in the second portion from coming into contact with successive impact positions of the first portion .