This is technically my 5th attempt at this, but I made a few improvements compared to my 4th. I changed the piano from an ADDsynth to a PADsynth, which changes the sound of a piano a little bit, even though I kept the harmonics the same. I also added a release sound by using SUBsynth, and it sort of imitates the sound of letting a piano key let go. Sometimes that release sound isn't great, it depends on what MIDI is being played through it.