on pages 26 and 27 of the manual it gives you what parameters to set. One of them (Fn-14) Buzz switch is the sound of the flash. A value of 0 = on and a value of 1 = off. Press an hold the ( Backlight/Fn) button, the one at the left of the top row of buttons until the Fn. is in the display. Once Fn. is displayed press the up button until 14-0 is on the display, then press the right button, this will change the display to show Fn.-14-1. Once it is displayed press the middle button and that will set the Fn. setting and you will see the music notes have disappeared.