I run a simple resonance test using the VSTs at hand (VSL Steinway, Pianoteq Steinway, Noire, ModernU, Garritan CFX). I have also tested others, but the results were mediocre or not significantly different. This is not to be exaustive, but to give an idea of what is out there.
Since my experience with acoustic grands is limited, I don't know how well implemented the resonances are, but Pianoteq and Noire stand out as the best ones. Noire is really good and the scripting is open for dissection and ideas...
This test was suggested by Charles Cohen in a PianoWorld post #3216573
Each WAV file contains 2 sets of 4 notes.
First set (resonance of hold C4):
- no silent note + C5 played staccato (midi vel=127, ticks duration=30)
- C4 silent + C5 staccato: C5 should continue to sound, as the second harmonic of the open C4 string.
- C4 silent + E5 staccato: E6 should be heard, as the fifth harmonic of the open C4 string.
- C4 silent + G4 staccato: G5 should be heard, as the third harmonic of the open C4 string.
Second set (resonance of hold C maj inv chord instead of C4 - C4/E4/G3)
- no silent notes + C5 played staccato
- C chord silent + C5 staccato
- C chord silent + E5 staccato
- C chord silent + G4 staccato