Assertion: tone | /r/HasProperty | audible
Facets:
value: usually
type: TEMPORAL
value: almost
type: DEGREE
Source sentences:
text: Because the tones are audible, in systems with solid received signals, tone levels are sometimes set lower so that radio users are not forced to listen to them at a high level.
text: As a conceptual example of an ascending Shepard scale, the first tone could be an almost inaudible C 4 (middle C) and a loud C 5 (an octave higher).
text: The tones are usually referred to as sub-audible tones.