I've been progressing through a slap bass book that explained how dead or choked notes could be played with either hand but didn't go into any detail. For awhile I have just been slapping the string while muting it with my left hand, but for some of the stuff I'm getting into this method isn't fast enogh. How do you create the sound of a choked note with just the left hand? I've been improving the speed and volume of my cross string hammer-on's, but I can't figure out how to get a loud 'dead' note without using my right hand. Any suggestions?