Assertion: key's signature | /r/CapableOf | feature double-sharps/flats
Facets:
Source sentences:
text: that, only when modulating between key signatures featuring double-sharps/flats, may the need to respell natural notes enharmonically arise); however, this may or may not require the use of altered chords (operating in the harmonic minor without augmented sixth would not) where the effect can be less subtle than other modulations.