Assertion: bagpipe's drone | /r/HasAspect | some provision
Facets:
value: for tuning
type: PURPOSE
value: by adjusting the bore length
type: MANNER
Source sentences:
text: All drones have some provision for tuning, commonly by adjusting the bore length via sliding joints or other mechanical arrangement, or by adjusting the reed - either by changing its depth of seating and/or by altering the weight and/or the effective length of the reed's vibrating blade(s).