Assertion: descant | /r/CapableOf | feature two thumb valves
Facets:
value: generally
type: DEGREE
Source sentences:
text: A 5-valve descant generally features two thumb valves (one for the Bb/F alto change valve, the other for the A/stop/F-extension), while a 6 valve descant (which usually has a separate A/stop valve and F extension) often has two thumb valves and an additional valve for the left-hand pinky.