I changed the instrument by going to the Wikipedia page and selecting number 23 - a harmonica. I changed this in the main.rs file in line - let mut instrum: Vec<u8> =vec! [1, 23, 18, 25, 41.....But it didn't change. Do I need to change something else?
In your photo what are the two boards with the blue potentiometers?
Arduino: Control Servo with Buttons