Chiddy Bang-Heatwave..no exposed vocals, EQ or were they given the acapella?

[Khan88]

For the Chiddy bang song, heatwave, Ì just listened to the whole original, and there are no exposed vocals, how did chiddy bang take it out and put it in there song? EQ? What other methods. I am really eager to get into sampling but I am so confused in this beginning stages.

original:
http://www.youtube.com/watch?v=XE2fnYpwrng

chiddy:
http://www.youtube.com/watch?v=l2OfdFdjhSA