Did all I asked it to, for a trial.
I was looking for something to replicate notes so I could determine a key for a given arrangement on the fly. This did the trick. Shame you can’t map keys to your computer’s keyboard (Maybe you can, but I’m too lazy to dig for a real solution). If you need something to hit keys on, and nothing else (like me), then this is for you.
8Bitcsarf about Claviatura, v1.4.0