Digression: consonance and dissonance

Beats and harshness

 ‐beats with two plus tones
 ‐sum/difference tones (intermodulation distortion)

Beating, noise, distortion and critical bands

 ‐aggregation inside critical bands
 ‐a product of streaming dissonant sounds together?

Masking

Total harshness measures

 ‐statistics vs. analytic vs. auditory emulation based models