Nobody really remembers what the button did because we were all too busy pressing it multiple times to notice. Y'see, the button used to have a voice sample attached to it, which made for some fantastic rhythmic manipulation: "D-D-D-D-D-D-Dict-D-Dictionary", we'd go. Good times.
We're telling you this story because the freestyle sampling in DJ Hero always reminds us of those childhood days. And it's part of the reason we can't wait for DJ Hero 2. Which brings us to the actual news: Activision's confirmed an October 19th and 22nd release date for DJ Hero 2 in the US and Europe respectively. That's one week before Rock Band 3.