To clarify once more - if you want to join the voice chat there will be a google hangout. Google hangouts are literally just a link you click and it brings you to the group, just make sure you're wearing headphones and are in an otherwise quiet environment (seriously guys, no background noise). Not only because it's shitty to people trying to have a conversation, but because people watching are listening to the stream as well as our voices.
So, the voice chat will be google hangout. The text chat will be using the twitch channel - all you have to do is log in to twitch. Since all twitch chats are just IRC's technically, there might be a way to integrate the TLS IRC in there, but it'd be better to just log in to twitch.
Short version:
voice chat over google hangout
stream via twitch (probably)
text chat via twitch
we will be streaming our voices and the stream simultaneously over twitch
The way it works is all of us who are using our voices use the hangout and watch the official source stream so we see everything at roughly the same time. Everyone who is watching the stream and listening to us will be watching only the TLS Twitch (or YouTube, if we decide to use YouTube, which we probably won't). You can then interact with all of us via the text chat that is naturally on Twitch.
Channy, Twitch should be fine, I'm making the settings fairly bandwidth-friendly. Note however that even with bandwidth-friendly settings, if you have a torrent client or anything like it open Twitch is a cunt about it. I have 100 fibre optic broadband and twitch is still a dick even though I limit the bandwidth usage of all my software. If you want to watch the twitch stream, shut the rest of your shit off and you'll be good.