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The Basic Layer is the defining characteristic of an ambience. In the Ambience projects, the item source files are Octo 3D ORTF recordings split into four-channel files that represent positions above or below the height of the listener’s head (Lo is below and Hi is above). Depending on the type of ambience, there is usually a Modulation Parameter track with one or more envelopes to control characteristics of the sound.

The Birds and Animals subprojects also have Basic Layer tracks. They have items with mono or stereo source files, which are not mixed using ambisonics.