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How can I output 4 sinewaves with defferent Amplitude from AD9959 in single-tone-mode?

I read the datasheet,and know AD9959 can control independent frequency/phase/amplitude  between channels. But I'm confused with that how  I can change the amplitude of sinewave in signgle-tone-mode. Dose RU/RD work? I want that the amplitude of sinewaves from 4 channels can be comtrol and don't be changed later.