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Audio Post Production Knowledge Base
Loudness
The perceived quality of sound directly correlated to an increase or decrease in amplitude (volume). Loudness is a highly subjective measurement that varies from person to person and is affected by many factors such as frequency, duration and sound pressure levels (SPL). More objective measurements 
Vinegar Syndrome
Vinegar Syndrome is an indicator of a complex chemical process caused by the decomposition of the acetate film base of certain types of mags and audiotapes. Over time, this deterioration process yields acetic acid (or vinegar) as a pungent byproduct, giving this syndrome its distinctive odor and
Amplitude
A sound wave moving through the atmosphere pushes air. As the air in front of the wave gets compressed, the air pressure goes up. The magnitude of change in the air pressure from that sound wave is its amplitude. The bigger its amplitude, the louder the wave will sound.
