At a nyckelharpa workshop I tried a 3-row chromatic and began to understand how they work, though found bowing sideways a bit awkward. But last week I encountered some moraharpas - both diatonic and chromatic - and was able to play a tune within minutes! The diatonic had but one melody string (D) and two drones (D & or G) while the chromatic had two melody strings (D & G) with a D drone. Simplicity, and obtainable in Uppsala for a mere £1000 or so squids.