pedal stool

Noun

(music) A stool with vertical foot levers that attach to the pedals of a piano, organ, or similar instrument, thereby assisting children and other players who cannot reach the pedals normally.

Japanese Meaning

音楽用のペダルスツール：ピアノ、オルガン等の楽器のペダルに取り付けられる縦型の足レバー付きスツールで、通常の方法ではペダルに届かない子供やその他の奏者の演奏を補助するために用いられる

What is this buttons?

The teacher placed a pedal stool under the young organist so she could reach the pedals during the recital.

Google Translation / DeepL Translation

先生はリサイタル中、若いオルガニストがペダルに届くように、オルガンのペダルに取り付ける縦型の足レバー付き補助椅子を彼女の下に置きました。

Details

Sense（1）

(music) A stool with vertical foot levers that attach to the pedals of a piano, organ, or similar instrument, thereby assisting children and other players who cannot reach the pedals normally.