Hey so I know how to slap bass by basically whipping the bone part of the side of my thumb off the string and I would like help from you guys to figure out to slap bass with up and down strokes like how victor wooden does it and it can do the down stroke it's just the up stroke that's hard to figure out and I've already tried practicing this for hours before and don't know if it's just something you keep trying and get it after awhile or if there's and certain way to do it.