To enter the notes go to 'Options' and select 'Cheat' and enter the code you want to enable. You have to strum as you press the buttons in the code or if two buttons are indicated they must be pressed together as you strum as they represent one cord. The letters in the code below correspond to the coloured frets.

R = Red, B = Blue, G = Green, Y = Yellow, O = Orange

Press GR_BO, GRYB_, GRY_O, G_BYO, GRYB_, _RYBO, GRYB_, G_YBO, GRYB_, GRY_O, GRY_O, GRYB_, GRY_O (because this code uses 4-note chords there will be no sound).