Congratulations, Mrrzy! Your progress is delightful.

I used to have one of those. (gave it to a family with children) I liked to play "Rose of Spanish Harlem" on it, as done by the Mommas and the Poppas, if that's how you spell that. It was fun to take two mallets and do the pretty thirds on the la-la-la part.

I don't think post-its will change the tone. Try it and see.