Do English Unstress Syllables Use Creaky-Voiced Sounds for Lower Pitch?

[fxdung]

Does unstress syllable in English have creaky-voiced?To low in pitch and small in amplitude of the sound, the gap between vocal cords must be small.Is that correct?I do not know whether we narrowed the vocal cord(glottis) or not in unstress syllable in English?

 

[hmmm27]

Relative amplitude. I suppose "creaky voice" could be a side effect in some people.

Are you building a speech synthesizer ?

 

[fxdung]

I like to know mechanism of making sound to easy the learning English.Do we need to narrow vocal cords in lower pitch sound?