Assertion: tuba's valve | /r/HasProperty | pressed
Facets:
Source sentences:
text: In contrast to the system in use in tubas and euphoniums, the default 'side' of the horn is the longer F horn, with secondary lengths of tubing coming into play when the first, second or third valves are pressed; pressing the thumb valve takes these secondary valve slides and the extra length of main tubing out of play to produce a shorter B♭ horn.
text: The echo cornet has a mute chamber (or echo chamber) mounted to the side acting as a second bell when the fourth valve is pressed.
text: This is a whole-tone valve arranged so that with the valve in the "up" position the valve loop is engaged, but when the valve is pressed the loop is cut out, raising the pitch by a whole tone.