Trinaural

The Hamilton Trinaural Sound System. Remember the night we dreamed that up? Three cartridges, needles, amplifiers, speakers. Mounted in three rooms. A man in each room, listening to each rig.

However, I was informed that some current stereo releases are "trinaural" — three-channel rather than two — and I'd like some information about this. Are these actually three-channel stereo tapes?

The talking drum held under the arm had soft sides that yielded three different tonal pitches, high, middle, and low, according to the pressure of the arm. This amounted to a “Morse Code” with three signals — a trinaural rather than a binaural system.