Missing: in polyphonic instruments, notes affect other notes. For instance, on a piano, a staccato C2 by itself is a totally different beast from a staccato C2 played while the dampers are off other keys, from a haunting reverb from notes in a higher register to deep overtones from notes in a lower register.
Most simulated pianos these days add the extra harmonics when the sustain pedal is pressed, but very few seem to get the harmonics from the dampers being lifted per-key; PianoTeq gets this right.
Most simulated pianos these days add the extra harmonics when the sustain pedal is pressed, but very few seem to get the harmonics from the dampers being lifted per-key; PianoTeq gets this right.