This is my third iteration of this same piano, and this time, I've improved both the attack and release of the piano to have a more realistic falloff. I did this by changing the amplitude envelope to have a non-linear curve, and I also changed the phase randomness in the unison to be less random. These changes makes the high notes in particular sound pluckier, which is what I would expect for a real piano, and I also changed the analog filter to one that doesn't change the volume of higher frequencies, making the high notes way louder than they were before.

This may be my last piano from scratch, before I apply a fourier transform to a real piano sample, then throw that data into the synthesizer.