This works for German bow. Take your rosin in container, tie about a yard-long piece of string to it and tie the other end to your arm right above the elbow. Let the container hang down near the floor while you are playing. You will have to rotate your bass to the right somewhat so you can watch the string and play your open 'A' at the same time. Work on your spiccato using only wrist and fingers and generating a very short, dry 'tick'. It takes a fairly high bounce. When your motion is isolated to the hand, your elbow is all but motionless, and the string will move in an almost vertical motion, bouncing the rosin and hardly swaying.
It's pretty difficult to start working on isolating your hand from your elbow without physically holding your right forearm still with the left hand until the right wrist becomes strong enough. Needless to say it's challenging to play the bass while holding your right forearm with your left hand. Watching the string just makes it easier to isolate that motion.
Ah made that up mah self.
Spiccato driven by the wrist and fingers is what my teacher recommends. He has been in Houston sym. 41 years and really makes this look EFFORTLESS. Great control at speeds I can't begin to approach.
I'm guessing that ultimately the weight of the whole arm MUST be used to get a heavy fortissimo, but control from the hand can be a key to velocity. This is another way spiccato crosses over from drums - speed of repeated strikes mostly comes from rotation of the wrist - similar to the left hand of a drummer (traditional grip) - with horizontal motion supplied by the fingers (like a drummer's right hand).
Watching a drummer, you can see that just like bass, fortissimo utilizes the weight of the arm all the way from the shoulder. Not force, but inertia (like a karate chop). Since the surface we are striking is springy and naturally rebounds, force is not necessary and inertia is all you need.
Or is it...LOVE is all you need?
