Hello Lorenzo!
Yes, of course you can get good sounds out of csound and the rest of them.
But it will take time, to get a good sounding (as in very natural) cello. It
takes some work. That is what I meant. The reason, why I suggested those was,
that they offer very great control over the sound. You have so many parameters
with the models, that they offer to the user.
Kindly yours
Julien
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