Thankyou both for your replies!
3234718 - one of the players in the Youtube video, Juninho Braga, has posted another video which is more of a straightforward demo of the Olinto, as opposed to a tune. Not being able to speak Portuguese, I can't tell you what he is saying, but I'm guessing that he likes it as he is playing it in his avatar, and he uses it in one or two other videos.
I must say that the tone appeals very much to my ears - but who knows how much of that comes from the bass, and how much is the result of mic placement, eq'ing, playing technique, etc? Nonetheless, I like the tone, so here is the video! http://www.youtube.com/watch?v=FuDLC0i39hQ
Any of our members played one in person yet?