You're right about piano -- modelers have gotten really good with those algorithms, perhaps because that was a starting point for digital synthesis? At any rate, I've heard even PCM piano patches which sounded fairly good, and once you put it in a mix with other instruments, it can be very hard for me to pick out the fact that it's digital.
I think fretted instrument models suffer due to the fact that the fingers rarely hold the strings identically for each note or each passage, and those very subtle variations aren't really captured by current modeling schemes.
I think fretted instrument models suffer due to the fact that the fingers rarely hold the strings identically for each note or each passage, and those very subtle variations aren't really captured by current modeling schemes.