Assertion: harpsichord | /r/SimilarTo | two keyboards
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Harpsichords with more than one keyboard (this usually means two keyboards, stacked one on top of the other in a step-wise fashion, as with pipe organs) provide flexibility in selecting which strings play, since each manual can be set to control the plucking of a different set of strings.