The voice was unexpectedly attractive; it was the low and dulcet note suggestive of romance; common in descriptions, rare in experience.
In addition to the dulcet piping of Gabriel’s flute, Boldwood supplied a bass in his customary profound voice, uttering his notes so softly, however, as to abstain entirely from making anything like an ordinary duet of the song; they rather formed a rich unexplored shadow, which threw her tones into relief.
There are no more uses of "dulcet" in the book.
Show samples from other sources
the dulcet tones of NPR Radio broadcasters
Despite the best efforts of some Republicans to elicit a hot-tempered response, the Supreme Court nominee answered every question in the same deliberate, dulcet tones that seemed to lull her opposition into, if not complacency, then at least resignation.
Time Magazine, 2009 -- http://www.time.com/time/politics/article/0,8599,1910486,00.html(retrieved 09/02/09)