4-string demonstration instrument.

https://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~77612~181694/full/150,/0/default.jpghttps://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~78280~181693/full/150,/0/default.jpghttps://images.is.ed.ac.uk/luna/servlet/iiif/UoEart~2~2~78564~181692/full/150,/0/default.jpg