Definition of modulatory in English:
modulatory
Pronunciation /ˈmɒdjʊlət(ə)ri/ /ˌmɒdjʊˈleɪt(ə)ri/
adjective
Of, relating to, or serving for modulation.
Origin
Late 19th century; earliest use found in John Earle (1824–1903), philologist. From modulate + -ory.