The keyboard is a Roland E80.The style says "Big Band 4"NMK.
This tells me that it could be from any manufacturer as NMK are
the initials of my friend, who had the main Roland dealership and
always, as a bonus for purchasing from him would take many styles
from different keyboards in his shop and install them on the Roland
with his initials after the style title,so yes it could be from a
KORG i3.