Thank you. Looks like the Topre are the ones I need. Now to find a reliable and simple way to have such a thing shipped to Europe.........
But if you just jam the keys then the area of the curve under the force chart (W=FxD) determines total energy expended.
They do it differently there?Show Image(http://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Integral_example.svg/220px-Integral_example.svg.png)
Just making it sound even geekier...