Gramophone and Notes

What are Gramophone and Notes in Match-3 Elements? You can find Gramophones beside pieces and you can activate them by matching pieces next to it. Once the Gramophone is activated, it will leave a note on the pieces beside it.

Pieces that have a note on it will change color for each turn that you make. This can be useful if you need a certain color, and you can have it changed by chance.