A Piezo sound is never the first choice for a nice acoustic sound, but if you end up having a track like that in your session and you have to make it sound good, you can use Universal Audio's OCEAN WAY STUDIOS Room simulation to Re-Mic the guitar and give the impression that the guitar was actually recorded in a great room. The result is not quite like really mic-ing an acoustic, but the effect are still amazing and could save your ass.
Gear from this video at Sweetwater:
Here is tons of stuff I use in my videos...
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