Sony HT-ST5 Operating Instructions Manual page 26

Remote control
26
US
  (on/standby) button
 INPUT button
 MUTING button
 VOL (volume) +/– buttons
 SOUND FIELD button*
 VOICE button*
 DISPLAY button
The display brightness can be switched.
Bright  Dark  Off

When the display brightness is set to "Off," the display is turned off
after the display shows operation status for several seconds.
 When the setting is changed to "Bright" from "Off," the display
shows the audio stream information.
 NIGHT (night mode) button*
 SW VOL (subwoofer volume) +/ buttons
Adjusts the volume of the bass sound.
 MENU/  (select)/ENTER/RETURN buttons
Select the desired setting by pressing the   (select) buttons
then register it by pressing the ENTER button.
* Refer to "Enjoying the sound effects" in the supplied Startup Guide.