Velocity-sensitive computer keyboard (nonfiction)

A velocity-sensitive computer keyboard is a computer keyboard with keys which are velocity-sensitive (by analogy with musical keyboard keys).

To quote myself:

I want a velocity-sensitive computer keyboard with appropriate software, for example:

• Render my word processor as an old-school mechanical typewriter, like Dad had.
• When I press a key slowly, make a faint mark for the character.
• When I press a key very fast, display animated sparks and make a heavy, stochastic-blurred mark for the character.

https://bbs.boingboing.net/t/leon-sans-a-font-generated-by-code/150726/3