Sasquatch - Vocal communication?

I only recall having heard of whoops, howls, and non-vocal noises (breaking things, walking, knocking, &c), but in the past three years BFRO has started acquiring reports and recordings of "chattering". They've also dug up an old (1970s) recording of whistles. Now, are these new developments, or are have they been around the whole time and we just didn't know it? Is this a sign of developed communication, perhaps to the point of speech?

As an interesting sidenote, the Samurai recording (see BFRO) does sound distinctly Asian. Why? What is it that makes up the Asian accent? Also, I could swear I'm hearing the word "umare" in there.

Things to think on:
- Infants have undeveloped vocal tracts, but they learn the rest of the human speech range fairly quickly. [--link--]
- Lots of other primates have advanced vocal communication. What noises do they make? What does their communication involve? (Vocal aspects, gestural aspects....)
- One of the BFRO research teams instructs its members to try to "talk with them". How? On the one hand, the recording indicates a primarily visual-gestural sequence, given that we don't hear the woman making any particular noises. On the other hand, the recording seems to have been cut down to only the important parts - people talking, stuff making noise, etc - maybe they cut out any sounds the woman was making? Worth thinking about.

Books to consult:
- Linguistics text, for information on phonology, primate studies, etc.
- Anthropology text, for information on primate communication, vocal tracts, etc