Does this gular sac design work?

I'm designing a species of tiny humanoids. They are about 13cm tall. Normally that would make them have very high pitched voices but I want them to be able to also speak in a lower pitch.

Siamang gibbons have gular sacs; they are a throat pouch that can be inflated and is used for making resonating calls and songs.

Would it be possible for these tiny humanoids to speak with their sacs inflated and is the design of the gular sac plausible?

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Does this gular sac design work?

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