A couple of weeks ago we went on a cruise in the Caribbean starting at Montego Bay in Jamicao. While going through the shed on the way to the ship there was a three piece band entertaining the passengers. The one guy was sitting on what I thought was a cajon, but it had 5 metal strips just below the opening. It reminded me of a thumb organ. The metal strips could be adjusted for resonant length. They were maybe 1" wide and 3 to 6" long.
What was this instrument?