The Ear 3C10
Pitch 3C20.10 Range of Hearing
Intensity of Attenuation 3C30.22 Sound Level Meter
Architectural Acoustics 3C50
Wave Analysis and Synthesis 3C50.10 Pasco Fourier Synthesizer
  Clown Clicker
Music Perception and The Voice 3C55.55 Tuning Fork on Resonance Box