Assertion: piano's pedal | /r/CapableOf | couple lower and upper keyboard
Facets:
Source sentences:
text: The design also featured a special fourth pedal that coupled the lower and upper keyboard, so when playing on the lower keyboard the note one octave higher also played.
text: The design also featured a special fourth pedal that coupled the lower and upper keyboard, so when playing on the lower keyboard the note one octave higher also played.