Exactly. To clarify: When you tug the string, you create a shockwave of tension traveling along it. Since this is a wave of actual moving matter, it is an acous

Exactly. To clarify: When you tug the string, you create a shockwave of tension traveling along it. Since this is a wave of actual moving matter, it is an acoustic wave, moving at the speed of sound (whatever it is for the string material).