MARC21-007: Sound on medium or separate of video
no sound (silent)
Sound is not present (i.e., the item is intended to be silent).
#
sound on medium
Sound is on the item, whether or not visual images are included.
a
sound separate from medium
Sound is on a separate medium, designed to accompany the images.
b
unknown
Presence or absence of sound on the item is not known.
u
Published