Twitch Q.

So i was wondering if there are some twitch users between us and what type of setup (streaming wise) they use
for myself i have made an account some time ago but hardly use it.. why? because i am always on teamspeak with some other 'idiots' talking about loads of nonsense, And i dont want that sounds on my stream.

So i was looking at possible streaming tools but i havent seen one that gives me the option to do the following:
1) stream my game + sound (just the sounds from the game itsels (standalone audiostream)
2) have a voice option so i can use push to talk to talk to people entering my stream (as in responding to chats instead of tabbing out)

i found this post. that tells how i can get a seperated audio stream, but do i lose voice then? on the other hand, i dont think iam the only one with this type of setup (loads use ts, skype, ventrilo ect) so i was expecting a tool that has this build in..

anyone has any suggestions?

oh and gibs: click