For a long time, I could never understand how Flea slapped a fill in the interlude of "All around the World" until I d/led a video of them performing live... apparently he wasn't even slapping, but just playing normally with his fingers and not even slapping. Whoa. He's done it on other videos I've seen too, where he just plays finger style ("Can't Stop"), but what's coming out is this insanely punchy, slapping sound. How? Is this the notorious "GK Growl"? (in my visits to GC, I've never figured out what exactly is that "growl") Or is it some cool effect he's using? Thanks!