3C ACOUSTICS
3C10 The Ear
3C20 Pitch
.10 Range of Hearing
3C30 Intensity and Attenuation
.22 Sound Level Meter
3C40 Architectural Acoustics
3C50 Wave Analysis and Synthesis
.10 Pasco Fourier Synthesizer
.xx Clown Clicker
3C55 Music Perception and The Voice
.55 Tuning Fork on Resonance Box