I'm not sure why you are lettering there. First of all, it is not recommended to carve the piano, because it is harmful to the piano. It has a great influence on the wood and vibration of the piano. Another point is that when carving, the only place that can be carved is the guard plate under the sound hole, because the material is plastic, but it is meaningless there. Hands are usually blindfolded, and it is difficult to see them unless they are scalded, so it is best not to do so. A guitarist who pursues sound quality will not do this. I hope it helps you.