The Sound Type Authority List provides data values for the Sound Type element.
Silent
scope note: Use for audiovisual materials recorded without sound.
Silent and Sound
scope note: Use for audiovisual materials partially recorded with sound and partially recorded without sound. The bulk of the materials should be silent.
Sound
scope note: Use for audiovisual materials recorded with sound.
Sound and Silent
scope note: Use for audiovisual materials partially recorded with sound and partially recorded without sound. The bulk of the materials should be sound.