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By analyzing the performances of twelve professional pianists, they found that different finger movements did not lead to differences in timing precision or in tone intensity. That is a novel finding. However, the actual relation between the finger movements and the resulting velocity of the piano key after contact was not studied as yet (a replication of this study on a modern pianola —like the Yamaha Disklavier or Bösendorfer— seems a logical next step).
My hunch is that the finger dynamics will not matter so much (as was in part suggested by this study). The gestures made by a pianist, including finger movements and what is generally referred to as piano touch, have more to do with habit and a sense of control, then that they actually have an influence on the key velocity that, next to the timing, effectively contributes to the sound and musical quality of the performance. This type of research will find out soon …
Replicating a performance on the guitar would be a little more challenging I think. Being a more volatile instrument (particularly electric guitar), one player's particular nuances would be much harder to track...with blues and rock players, it's often their inconsistencies that make up a lot of the personality and feel in their playing.
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