Examples of resynthesized vocalizations of happiness and sadness are given below. You can find the modified acoustic cues in the images of synthesizer control panel.
Resythesized versions are created using DAVID synthesizer.

Listen to a neutral vocalization:

lowpitch_f_neutral

Listen to the happy version of the neutral vocalization:

lowpitch_f_happy

Listen to the sad version of the neutral vocalization:

lowpitch_f_sad