Readonlyinstrument: stringThe instrument whose constants produced it, by name. A comparison plot must not be able to put two curves side by side without saying which instrument each came from: a T-98 fitted to a green roll's drawn line and a T-98 fitted to a red copy's curve answer different questions, and their difference is the point of the comparison.
Readonlykind: "dynamics"Readonlyvelocity: Float64Array
The dynamics of one part of the keyboard, with the velocity the travel maps onto.