The pitch is adjusted in "So (箏) no Koto" by moving bridges (called "ji") under each string, while the pitch is adjusted in "Kin (琴) no Koto" by pressing the strings against the board with the fingertips (Wagon uses moving bridges).
（2）「箏」では柱（じ）と呼ばれる可動式の支柱で弦の音程を調節するのに対し、（1）「琴」は弦を押さえる場所で音程を決めるという特徴を持つ（和琴は柱を使う）。