Quote Originally Posted by rounser
So it's sidechaining, but whilst the sidechain is in operation a hipassed version of the sidechained track can be heard (although the hipassed track isn't itself being sidechained, if you get me). If you give the start of "Call on Me" a listen, there's no bass in the track except for the kick when the kick is present, but the high frequencies of everything else remain (unlike normal sidechaining where everything would disappear). Quite clever.
So more like taking a highpass filter and wiggling it up and down with the beat! Mmmmm ... curious, will experiment with this a bit, it's a cute sound he's got there.