miyagi also developed a seventeen-stringed koto which has low tone like a cello and an eighty-stringed koto (a normal koto has 13 strings ). また宮城は、チェロ並みの低音域を持つ十七絃（通常の箏は十三弦）や八十弦箏を開発した。
the note an octave lower than the fundamental tone (the low tone range ), is called ' ryoon ' (lower tone ), the note an octave higher than the fundamental tone (the medium tone range ) is called ' kanon ' (medium tone ), and the note an octave higher than kanon tone is called ' daikan ' (high-pitched tone ). 基本音からの一オクターブ（低音域）を「呂音（りょおん）」、そのオクターブ上（中音域）を「甲音（かんおん）」、更にオクターブ上の高音域を「大甲（だいかん）音」と呼ぶ。
