Assertion: tuba's valve | /r/CapableOf | lower the pitch of the instrument
Facets:
value: by a fourth
type: OTHER
value: traditionally
type: OTHER
value: by adding extra lengths of tubing
type: MANNER
Source sentences:
text: Traditionally the valves lower the pitch of the instrument by adding extra lengths of tubing based on a just tuning:
text: A rotary valve actuated by the player’s left thumb connects this attachment to the main tube, thus lowering the pitch of the instrument by a fourth.