Just a little note... I'm trying to work on the early mission that involves listening to things. Unfortunately, I'm also using headphones. The high-frequency chirps for a bad signal and an interface change are pretty punishing when I have the sound cranked to figure out what's making that darned mumbling. I've been spending quite a while on this without figuring this out, but I'd want to throw my laptop out the window less if this weren't starting to physically hurt! EDIT: MidDipper on IRC helped me work on this and realize a worse problem: you can only see 2/3 of the floor plan on Firefox and I'm missing the entire left wall. This is not the case for Chrome.
