An audioTrack is the basic audio data container of a medium.
Attribute is
an unambiguous reference to this container in a given medium. (en)
An audioTrack object defines a component of an audioStream.
A
single set of samples or data in the storage medium. (en)
Represents a physical container or carrier to hold an audio stream.
This
should be usually defined by many attributes such as ID, format (e.g. 48 kHz/24
bits), linkage information (e.g. odd/even)… (en)