IPA: /ˈmɒdʒ.ə.lə.tɔːr.i/
KK: /mɑdʒəˌleɪtəri/
Relating to the process of changing or adjusting something, often to achieve a desired effect or balance.
The modulatory effects of the drug were evident in the patient's response to treatment.
Modulatory → It is formed from "modul" (from Latin "modulus", meaning measure or manner) and "-atory" (meaning pertaining to or having the quality of). The word "modulatory" refers to something that pertains to or has the quality of measuring or adjusting.
Think of 'measure' ('modul') and remember that 'modulatory' means related to adjusting or measuring something.