How to make guitar notes sound more resonant?

Warm Greetings:

I have the latest updated standard version of Pianoteq. I bought it mainly for the guitar. It was good, but not very good. After the latest update, I think they got rid of the box sound (I haven’t used this guitar for a long time, I think the box sound in my memory was in this guitar’s old version), the low notes are now very good, very resonant. The mid and upper notes are not resonant. They sound dull. I think the beauty of acoustic guitars lies in the notes’ resonance. Every guitar has a unique tone color. The resonance makes any tone beautiful. I hope I am very wrong about this and there is a control in the plugin that can increase the resonance. The only control associated with resonance is the Sympathetic Resonance knob which doesn’t do a thing.

Does anyone know how to make this guitar sound more resonant?

Thanks a lot