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This is the screen where you can change your keys, midi file playing while the game is in progress and your theme. If you want to change one of the keys just click on the box and a new window will pop up asking you to press a key. You can click the buttons with the text '...' to select a new midi file or a .tnp file (for themes). You can also turn the sound effects on and off by clicking the checkbox below the textbox with the path of your midi file.