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#3012450 08/10/20 08:31 PM
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I don’t find that chart to reflect the effort required to play those actions.


Harry Likas was the Technical Editor of Mark Levine's "The Jazz Theory Book" and also helped develop "The Jazz Piano Book." Harry spends his time teaching jazz piano online and playing solo piano gigs.
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I did find the difference between trigger and sustain weight interesting.

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Originally Posted by Fleer
I did find the difference between trigger and sustain weight interesting.
In thinking about that, I suspect it's another flaw in his testing. Once a key sends "Note On" it simply cannot send a "Note Off" unless the key comes up above the sensor point. I think the problem is that the very process of adding a weight to a key creates some inertia, which you can minimize by adding the weight v-e-r-y- s-l-o-w-l-y. But let's say he dropped the weight so that gravity pulled it onto its resting surface. The inertia could breifly lower the key by more than the force of the weight itself, and then it would release (bounce) back just a little, possibly enough to turn the note off. So the "trigger but not sustain" figures are probably meaningless.

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Originally Posted by anotherscott
But let's say he dropped the weight so that gravity pulled it onto its resting surface. The inertia could breifly lower the key by more than the force of the weight itself, and then it would release (bounce) back just a little, possibly enough to turn the note off.

I can think of a couple of possibilities. The standard key bouncing back up past both the top and bottom sensor to trigger a note-off sounds unlikely; one because it would indicate a very sloppy process (anything that fast would suggest a lower weight could have dropped the key in the first place), and two, the top sensor point tends to be very high in the keystroke in order to simulate the position of the damper.

It's also possible that some of these DPs will register an anamolous note-on in some cases where the top sensor stays triggered but there bottom sensor is only very momentarily tripped. I'm not sure what the mechanism would be but it could be that you describe-maybe the weight is enough to drop the key but too light to key the key down as your finger would, and so the rubber cap bounces a bit and the top sensor breaks its connection as well... What's odd is that it happens to multiple manufacturers. Maybe if they included a video to show it happening...


Bosendorfer D214VC ENPro
Past: Yamaha P-85, P-105, CP50, Kawai MP11, Kawai NV-10

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