That Rick hears a _b'_ 'to' seems to clinch the idea that we have a pronoun here. It would be nice to know whether the correct spelling of this pronoun 'me' is "so" ("soh") or "soo", but I suppose that even if we were absolutely sure of Cho's pronuciation we wouldn't know that it is correct.

In the letter above RAWA refers something Mark said. That would be Mark DeForest, long time Cyan programmer. Here is what Mark wrote to the Riven Lyst about Cho's speech.

Actually, the way the story goes is that Cho was instructed by Gehn to watch the caged linking spot in case someone (Gehn hoping for Atrus) will show up. When someone does, Gehn also instructed Cho to say a few D'ni phrases. However, Cho has been watching the cage for a *long* time and really thinks that no one will ever show up. Then _you_ link in, surprising Cho but in a way he is excited to see someone new and starts talking to you in Rivenese. Then Cho remembers that he is suppose to say a D'ni phrase that he has memorized (but not too well, its hard to get good help). After messing that up, he decides to do the next thing on Gehn's list, which is to take any linking books. But of course, with the help of the rebel, he screws that up too.