Kamil Kisiel
Power User
Currently it only shows if it's sharp or flat, but not by how much. The arrow could be an outline that "fills up" from the outside edge as the note got more in tune. eg: half a semi tone out and the arrow would be nearly empty, quarter of a semitone and the arrow would be hall full. When fully in tune you'd get a solid arrow as now and the opposite arrow would also appear.