Actually, this isn't a bad thought. A computer built on sound would be naturally quantum. Here's what I mean. Sound and electromagnetic vibration are more or less the same thing. They are vibration of particles, which are themselves vibration across the phases of the "aether."

Check into it. Anyone can build a "sound" computer at home by pin-point layering auto-body resins with different "impurity substances" placed in them to cause different vibrational frequencies. Electronics are not needed, but are helpful for detecting changes in the sound vibrations.