Start the player. Start playing a song. Turn the HOLD function on by sliding the swich at the top. Then, Hold the SEARCH/MENU button and enter the button sequence:
Right, Right, Left, Left, Right, Left, Right, Left, Up, Down.
Let go of the buttons, and put the HOLD switch back to its original position.
The backlight will cut out and you'll be in the service menu with "POWER" displayed.
Press DOWN a few times to select OTHERS and press Right to get into the menu.
Keep pressing down until you get to SP SET (Sound Pressure Setting).
Press Play/Pause to get into change the option. Then press SEARCH/MENU to
toggle the option on or Off (obviously, Off is for louder sounds).
Then either hold STOP or remove the battery to get the player out of the
service mode. For some reason, you'll have to go back into the player's options to manually turn the backlight on again after doing this.
