Sound mass is predominant bandwidth while grain is regular internal fluctuation

Evidence

The mass of a sound is where its bulk seems to lie. It is regarded as the predominant bandwidth of the sound. Indeed both mass and frequency are often present in environmental sounds and they may sometimes occupy quite independent positions in the spectrum, as would be the case with a sound consisting of a low throb and a high warble. … Similarly, grain is a special type of internal fluctuation, one with a regular modulatory effect. It is accordingly contrasted with transients, which are isolated or irregular fluctuations. Grain gives texture; it roughens up the surface of the sound and its effects consist of tremolo (amplitude modulation) or vibrato (frequency modulation). — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 465

Categorization

• DEFINE: Defines mass and grain, key cataloguing terms from Schaeffer.
• XREF: Chart architecture (attack/body/decay horizontal, duration/frequency/dynamics vertical) mirrors sonogram and ADSR envelope concepts in audio. — connects to: Sound grain is regular modulation, opposed to isolated transients — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 466; A sound’s mass is its predominant bandwidth in the spectrum — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 465
• SEED: These two terms give a ready vocabulary for describing ambient soundscapes as textures — useful for the reader’s field cataloging practice.
• corroborated: 2 independent passages support this claim — Schafer, Murray R, The Soundscape- Our Sonic Environment…, 465