Assertion: normal bassoon | /r/CapableOf | use extension
Facets:
Source sentences:
text: Many passages in his later operas require the low A as well as the B-flat immediately above it - this is possible on a normal bassoon using an extension which also flattens low B to B♭, but all extensions to the bell have significant effects on intonation and sound quality in the bottom register of the instrument, and passages such as this are more often realised with comparative ease by the contrabassoon.
text: (This is impossible on a normal bassoon using an A extension as the fingering for the B-flat yields the low A.)