I created this library by sampling my parents upright Linden piano. It’s not a very good piano and it’s a bit out of tune but the sound is still nice.

I recorded the sound with an SM58 suspended above the semi-open case.I moved the microphone in front of each strings played to get a sound as direct as possible. There is still a lot of noise and the result is quite lo-fi, but it is still playable and fun.