If you listen to Lil' Victa by SMV, you can hear Victor doing these at 1:55 to 1:55. I just wanted to know if there was any particular trick involved in this, since Victor seriously believes in economy of motion, and if there are any videos,sites or resources out there that could help me out. He does it with one finger in many videos, though I can't find any at the moment. I wanted to know if that was just pure practice and repetition, or if there's something i'm missing. Thanks.