Assertion: modern trumpet | /r/CapableOf | lower the pitch
Facets:
Source sentences:
text: Modern trumpets have three (or, infrequently, four) piston valves, each of which increases the length of tubing when engaged, thereby lowering the pitch.
text: Modern trumpets have three (or, infrequently, four) piston valves, each of which increases the length of tubing when engaged, thereby lowering the pitch.