I still believe that the majority of the difference in the feel is a better way to provide spring resistance to the keybed. Trying to duplicate a key hitting a hammer and the hammer in turn hitting strings is much different than what the tyros 2 keybed is doing. Weights...maybe. But inside the keybed mechanism not exposed under the frontend of the keys. The weights have to provide some sort of resistance to the downward pressure of your playing to achieve the simulation of striking something i.e. a hammer,string...whatever.

Dennis