What is the significance of Roland producing the V-Accordion, a digital version of the accordion?

As the world's first accordion with a modeling sound generator, what are the advantages of the V-Accordion?

How is the V-Accordion's PBM sound generator different from conventional sampling sound generators?

How does the V-Accordion’s playing feel compare to that of a conventional acoustic accordion?

The V-Accordions are all-digital instruments. What are the main advantages of a digital accordion over an acoustic accordion?

I would like to play the FR-7 / FR-3s / FR-7b's sounds from a PA system. How can I set the volume of the PA system to prevent acoustic feedback?