Drum machines and metronomes a very valuable tools; but the one thing -- the *one* thing -- that will improve your timing is your left hand. (Assuming all of us play right-handed; yes, Lil Guyland Leday is excused ;) Play them frogs. Play 'em till you get 'em down pat. When you do, the right hand will fall into place and accelerate your learning. I'm still trying to get 'em down. It ain't easy and it can be frustrating. Don't give up.