What Software Does It Seem He's Using?

http://www.youtube.com/watch?v=fhA-LfSWHBI#t=4m01s

Ableton Live.

are you sure? in his screen, he’s scrolling the up-left quadrant of his screen, and selecting a track/file/something in the top-right. also looks like track volumes in the lower left.

It is hard to see. It can be MixVibes Cross.
MixVibes Cross

;)

Yeah, I’d say ableton too. Idk about mix vibes…

That’s how abeton works right? if you have your browsers open and use the play buttons on the right.