Percussionistic

Coming from a drumming background, it’s fairly easy for me to play with mallets, do the rolls, and coordinate the two hands. However, it needs a bit of learning and training to get used to holding two mallets in each hand. It is of course very important to be able to play each mallet independently as much as possible.
I discovered a simple exercise that helped me a lot in separating inner mallets and having a lot of power and precision in playing at different dynamics.
The main aim of the exercise is to separate the movement of the inner mallets to two distinct movements: wrist rotation, and finger pressure.
These are self-explanatory and can be used with any of the different grips used. The two exercises:

1. Wrist movement: Practice playing scales, or just single notes alternating the inner mallets. Make sure your finger are not moving and that the mallets are moving only through the wrist. Obviously, there are unlimited techniques that can be practiced. THe main  aim is to become aware of the wrist motion, and give it flexibility in different tempi, dynamics, and notes. While this is happening, the finger(s) holding the inner mallet should be holding it in place with as much relaxation as possible, making sure the finger(s) are not causing the motion.
2. Finger movement: Practice the same scales / notes, making sure that the movement is caused solely by the inner finger(s) and that the wrist is not moving at all.

This technique helped me a lot in isolating the inner mallets movement to two different sets of muscles, and focusing on each one made me much more aware of the muscles. I feel I’m getting closer to playing with stick even though I’m holding two mallets.
Eventually, you should be able to utilize the necessary muscle groups together, minimizing the effort and movement, and having more control over volume, tone quality, and dynamics.You can start utilizing a motion similar to the Moeller techniqe, which helps a lot with what you want to do after hitting the keys, and the amount of dampening you want to apply.