General information
The infotainment system is a single functional unit with an information display and an on-board computer (with appropriate equipment) (see Section 17).
Depending on the configuration, various audio systems can be installed on the car, equipped with additional optional equipment and an information display of various types, depending on the desire of the consumer.
It is also possible to connect an external signal source to the infotainment system, such as a mobile phone, navigation system, etc. The compilers of this manual recommend entrusting the connection and installation of additional equipment to Opel service stations, where you can also get comprehensive information about the functions, settings and rules for using this equipment in conjunction with the infotainment system.
In this Guide, the control methods and capabilities of the audio system are considered using the example of a basic sample of the CD 30 / CD 30 MP3 audio systems.
The standard equipment of this audio system includes a radio receiver with automatic tuning and recall from the memory of pre-tuned frequencies, with the ability to receive radio stations in RDS format, a CD player and an optional MP3 disc player. The infotainment system has an automatic volume control to compensate for road noise and a digital equalizer with five preset tone controls to optimize the sound.
With the appropriate configuration, the system has the ability to connect external devices (e.g. mobile phone) and remote control using the buttons built into the steering wheel. Well-designed controls and a large, easy-to-use power and volume button make the system easy to operate.
Anti-theft system
The infotainment system is equipped with an electronic anti-theft system. An individual security code has been entered into the electronic device - it is impossible to activate the audio system when installed on another car.
Attention: If it is necessary to disconnect the battery, before starting work, make sure that you have the correct combination to put the equipment into operation after connecting the battery. The security code must be listed in the owner's manual for the infotainment system - it must be kept outside the vehicle. In case of loss of the combination, seek help from the specialists of the Opel branded service station.
Note: On models produced since 2005, the security code is recognized by the electronic system without the intervention of the owner and its input when connecting the battery is not required.
Information display
Depending on the configuration, a display of one of the options is mounted in the instrument panel (see Section 17 for details).
When the audio system is activated, information about the source of the audio signal appears in the information display field:
- Radio frequency band/CD player mode;
- Name or operating frequency of the received radio station / number or name of the CD entry;
- Depending on the current settings of the audio system, the corresponding indicators light up in the display field (see below).
The information display allows you to monitor the current audio system settings and adjust the system settings.
General Infotainment Controls
The location of the controls on the infotainment system panel is shown in illustration 19.1, to which all references in the text refer.
19.1. Location of controls on the infotainment panel
Audio activation/deactivation
The infotainment system is activated by pressing the center button of the rotary volume control (8). The system will be activated in the playback mode that was set before the system was deactivated.
Press the button again to turn off the system (8).
Note: If you activate the infotainment system with the ignition off, the system will automatically turn off after approximately 1 hour.
In addition, it is possible to activate / deactivate the system when the ignition is turned on / off (ignition logic) - to control in this mode, it is necessary to turn off the ignition without turning off the audio system - the system is deactivated. The next time the ignition is turned on, the audio system will be activated in the mode that was set before the ignition was turned off.
The auto-on feature is set at the factory settings of the system and is enabled by default. If necessary, it can be turned off - the audio system will be activated / deactivated only by pressing the button (8).
To deactivate the auto-on feature:
- Press the SETTINGS button (10) - the display will show «Audio»;
- Press the bottom sector of the 4-position switch (14) - the display will show «System»;
- By sequentially pressing the right sector of the 4-position switch (14) select menu item «Ign. Logic ON/OFF»;
- By pressing the top or bottom sector of the 4-position switch (14) select the desired setting:
- when choosing «Ign.Logic ON» the automatic switch-on function is activated;
- when choosing «Ign.Logic OFF» the auto-on function is deactivated.
Approximately 6 seconds after the last button press, the display will return to the main menu display mode.
Note: If the battery is disconnected and reconnected, the auto power on function will be reactivated.
Sound volume control
The sound volume is adjusted by turning the volume control knob (8).
Note: On models equipped with SSV sound level control (Speed Sensitive control Volume), the volume of the audio system will be adjusted automatically depending on the speed of the vehicle.
When activated, the infotainment system starts playing the sound at the last volume setting. With the appropriate menu (see below) You can pre-set the maximum volume level when turned on. The selected maximum volume level when activating the infotainment system will only be set if the volume before the system was turned off was higher than this setting, and the infotainment system must be turned off for at least 5 minutes with the ignition off.
If necessary, the sound can be turned off without turning off the system as a whole (sound blocking). To do this, hold down the volume button for more than 2 seconds (8) - the display will show «Mute» and audio sources are turned off.
Note: When the audio system receives a traffic signal (see below) the sound blocking is automatically released.
To unlock the sound, press the button or turn the volume knob (8) - The display will show the current playback mode.
Adjusting the sound settings
The sound parameters are adjusted through the corresponding menu and buttons «BASS» (15) «TREBLE» (13) on the infotainment system control panel.
To enter the sound settings menu, press the button «SETTINGS» (10) - the display will show «Audio». If the display shows «Settings», press the bottom sector of the 4-position switch (14) to go to menu item «Audio».
The choice of sound parameters to be adjusted is made by successively pressing the right / left sector of the 4-position switch (14), - the names of the selected parameter will be displayed in the field of the display window in the following sequence:
- FADER (front and rear speaker volume balance) (with appropriate equipment)
- BALANCE (volume balance of left and right speakers)
- SOUND (EQ mode selection)
- TA VOLUME (traffic announcement volume)
- SDVC (automatic volume control system depending on the speed of movement)
- EXT.IN.VOL. (the volume of the playback signal from an external source, such as a mobile phone)
- ON VOLUME (sound volume when the audio system is activated) «-» FADER PTY etc.
After selecting the desired parameter, its adjustment is carried out by pressing the upper / lower sector of the 4-position switch (14). The FADER, BALANCE, EXT.IN.VOL., ON VOLUME parameters are adjusted using conventional units from -12 to +12. When you select the desired value, it is automatically entered into the system memory.
Note: New minimum volume for traffic announcements (when setting the TA VOLUME parameter) will only be set if it is lower than the previously set minimum traffic announcement volume.
When the SOUND parameter is selected, the equalizer settings after each press of the button switch between 5 preset modes - the corresponding inscription appears in the field of the display window, for example «Rock» or «Jazz».
With the SDVC parameter, you can adjust the level of road noise compensation by selecting one of the values from 0 to 5.
The setting mode is exited by pressing the button «SETTINGS» (10) - the selected playback mode will appear on the display. The settings menu can be exited automatically by a timer signal if the settings are not used for more than 3 seconds.
Note: When exiting the menu on a timer signal, the display will show the inscription «Audio», and then the name of the current audio source, the GID will display the general settings menu «Settings».
Treble and bass tone can be adjusted using preset EQ modes (see above) or in manual mode.
Note: When tuning in manual mode, the previously set equalizer mode is cancelled.
To manually adjust the bass tone, press the button «BASS» (15) - the corresponding inscription and the previously selected low-frequency timbre level will appear in the display window. Adjustment is carried out by pressing the upper / lower sector of the 4-position switch (14). Adjustment is carried out using conventional units from -12 to +12. When you select the desired value, it is automatically entered into the system memory.
Note: The bass tone control applies to the currently selected audio source and is memorized separately for the radio and CD player.
The setting mode is exited by pressing the button again «BASS» or automatically by a timer signal when not using the settings for more than 3 seconds.
Manual treble adjustment is performed in the same way as bass adjustment by pressing a button «TREBLE» (13).
Radio
Unlike a device with a fixed antenna, there are features of receiving a radio signal by a car radio, which are determined by the proximity of the antenna to the ground, a constant change in the distance to the transmitter, multiple reception of reflected signals and overlapping signals from various radio stations. Due to these features, interference and noise, sound distortion, and even a complete cessation of radio signal reception can occur.
In addition, the quality of radio signal reception depends on the power of the transmitting station and the distance from the signal source, on the presence of shielding buildings and structures (houses, bridges, etc.), as well as from the influence of terrain conditions (mountains, lowlands, etc.).
Note: Using a cell phone in or near a car may interfere with the radio.
Radio activation
When activated, the infotainment system is activated in radio playback mode, if it was installed before the system was switched off.
To activate the radio from the CD playback mode, press the button «FM/AM» (7). Subsequent presses of the button switch the receiver bands in the following order: FM (VHF)» AM (medium and short waves).
When the radio is activated or when switching between frequency bands, the frequency of the radio station that was tuned in the last time the radio was used is selected.
Radio tuning
Tuning the radio can be done in the following ways:
- Automatic search for radio stations;
- Manual search for radio stations;
- Search for radio stations by program type (RDS radio data system).
Automatic setting
Automatic frequency tuning is done by pressing the 4-position switch with a short delay (14), - this activates the automatic search for the nearest frequency with the received signal and the display shows the inscription «Seek» before the operating frequency of the received station. Depending on pressing the right or left sector of the switch, the search is performed in the direction of increasing or decreasing frequencies.
Note: RDS and TP functions must be disabled when searching automatically (see below).
While searching, the playback sound is muted. When auto tuning is complete, the radio will begin playing the newly tuned station. If the radio does not find any radio stations, it automatically switches to a search mode with a higher sensitivity. In case of unsuccessful search and after this attempt, the signal of the radio station selected before starting the search will be played.
Manual setting
If necessary, the frequency of the desired radio station can be tuned in manually.
Warning: The frequency setting must not be done while the vehicle is moving!
By briefly pressing the button of the 4-position switch (14) the change of frequencies will occur step by step when you click on the right sector - in the direction of increase, when you click on the left sector - in the direction of decrease. This function is used to fine-tune the frequency.
If you know the frequency of the required radio station, hold the appropriate sector of the switch (14) pressed until this frequency is reached - the display shows in front of the current radio frequency the inscription «MAN». While searching, the playback sound is muted and reactivated when the button is released.
Radio Data System (RDS) (FM)
Radio Data System (RDS) is a broadcast service that allows FM stations to broadcast additional digital information along with the regular radio program signal.
Radio receivers equipped with radio data systems and gateway decoders (RDS/EON), when tuned to broadcast frequencies, a number of FM radio stations are able to read special service information, which allows you to use some additional functions, such as: determining the name of the radio station, automatically switching to alternative broadcast frequencies of the selected radio station, detecting and transmitting traffic information service messages, searching for programs of a given themes, etc.
To activate the RDS function, briefly press the button (1) - the corresponding indicator should light up in the display field. If the currently tuned radio station does not support the RDS format, the radio will automatically search for the nearest signal from the corresponding radio station. In the display field, instead of the current frequency, the name of the radio station broadcasting will be displayed.
Note: When the automatic station memory function is turned on (see below) the RDS function is activated automatically.
To deactivate the RDS function, press the button again (1) - the corresponding indicator on the display should go out, and instead of the name of the radio station, the current tuning frequency will be displayed.
Selecting RDS radio stations
The Infotainment system stores all received FM radio stations in the backup memory. The station data list is automatically initiated when TP station search or auto station memory function is activated (see below). This sorts the RDS radio stations in the channel list by radio station name (e.g. HR1, HR2, etc.).
This list is manually initiated by holding down until the button beeps «RDS» (1) - the display will show «Memory FM», then «MEM» and the operating frequency of the received radio station. To select RDS radio stations from the list, briefly press the left / right sector of the 4-position switch (14) - the radio tunes in to the next RDS station in the list.
To search for RDS radio stations without using the list, you must, with the RDS function activated, (the corresponding indicator lights up on the display) keep the left/right sector of the 4-position switch pressed until the inscription appears on the display «Seek» - searches for the nearest radio station transmitting RDS signals, while searching, the playback sound is muted.
Note: If the traffic announcement function was previously activated (TP) (see below), the radio will only search for stations that support this format.
Selection of programs by type of transmitted messages (PTY)
Many RDS radios transmit a PTY code indicating the type of program being broadcast (e.g. NEWS - news). Using the PTY code, you can search for radio stations by the type of programs they broadcast.
This function is activated by selecting the corresponding parameter in the settings menu (PTY) (see above).
Each time you press the top/bottom sector of the 4-position switch (14) the next name of the program type will appear in the display field (see explanatory table). After selecting the desired type of programs, you must press the right sector of the 4-position switch and hold it down until the inscription appears on the display «PTY» - the playback sound is muted and the search for a radio station broadcasting a program of the specified type is activated. If the radio does not find an appropriate radio station, you will hear the last tuned radio station.
PTY Program Type Classification
Program types | Display message |
News | NEWS |
business news | AFFAIRS |
Information | INFO |
Sport | SPORT |
Education | EDUCATE |
Radio plays | DRAMA |
culture | CULTURE |
The science | SCIENCE |
Miscellaneous | VARIED |
Pop music | POP M |
Rock music | ROCK M |
road music | M. O. R. M. |
light classical music | LIGHT M |
Classical music | CLASSICS |
Other music | OTHER |
Weather | WEATHER |
Finance | FINANCE |
Programs for children | CHILDREN |
social events | SOCIAL A |
Religion | RELIGION |
Live | PHONE IN |
Trips | TRAVEL |
Leisure | HOBBIES |
jazz music | JAZZ |
Country | COUNTRY |
national music | NATION M |
old hits | OLDIER |
folk music | FOLK M |
Documentary Programs | DOCUMENT |
Regional program search function (REG)
Activation / deactivation of the REG function is done by pressing the button (5) on the infotainment system control panel. When this function is activated, the corresponding indicator lights up in the display field - when searching for and selecting RDS radio stations, the regional broadcasting code will be additionally checked.
Traffic announcements (TP)
Reception of traffic reports is possible in the FM band, as well as when playing cassettes or CDs, regardless of the activation of the RDS function.
The sound level for traffic announcements can be set in advance by selecting via the setup menu (see above) TA VOLUME parameter.
The traffic announcement function is activated by pressing the button «TR» (4), - If the station currently tuned in is not broadcasting traffic announcements, the search for the station with the strongest signal and traffic announcements is automatically started. When the function is activated, the indicator appears in the display field «[TP]» - if messages are being broadcast, or «» - if no radio station is currently transmitting traffic information.
When receiving an information message, the audio system will automatically stop playing the current mode and switch to the frequency of the traffic announcement service channel - the corresponding indication will appear on the display. The transmitted information is broadcast at the volume preset for traffic announcements. At the end of the broadcast, the audio system will return to the previously set settings.
Playback of an informational message can be interrupted before the end of its broadcast by pressing the button «TR», - the audio system will return to the previously set settings and the TP function will switch to waiting for the next message.
The function is deactivated by pressing the button again (4).
The search for radio stations broadcasting traffic announcements can be performed by pressing the right/left sector of the 4-position selector switch in the same way as when selecting RDS radio stations (see above), but with the TP function activated.
This audio system allows you to listen to traffic announcements without playing other broadcast sources or CD recordings. To do this, you need to turn off the sound by blocking (see above) - the display will show «Mute», or by turning the volume knob (8) to the far left. In this case, the audio system will only play the received traffic announcements at the volume preset for this function (see above).
When an external audio source is connected to the audio system (e.g. mobile phone), while this unit is operating, playback of other audio sources (including and traffic announcements) not available - the display will show the inscription «Extern In». However, if necessary, you can interrupt the playback of audio from an external source and switch to receiving a traffic report. When the TP function is activated, when receiving a message on the screen instead of the inscription «Extern In.» the name of the radio station broadcasting the traffic announcement appears. To switch to the message playback mode and back, press the button «TR» (4).
Memorizing presets
Up to 12 FM radio station settings can be stored in the radio's memory (6 each in FM and FM-AS level) and up to 12 AM radio station presets (6 each in AM and AM-AS level).
To activate the FM-AS or AM-AS level, press the button «AS» (2) on the control panel of the system after the preliminary selection of the FM or AM band - the corresponding indicator should light up on the display. To go to the first level of the corresponding range, you must press the same button again - the indicator in the display field should go out.
Entering frequencies into the system memory is performed in the following sequence:
- a) Tune in the desired radio station manually (see above).
- b) Press one of the 6 preset radio buttons (12) and hold it for about 3 seconds until a beep sounds - during this time, the frequency previously entered in this memory cell is displayed on the display screen. After a confirmation signal, the radio receiver starts broadcasting the newly tuned radio station, and the name or operating frequency of this radio station appears on the display - the setting has been memorized. Note: At the moment the button is pressed, the sound playback will be temporarily stopped and will resume when the button is released.
- c) Repeat the above operations with other buttons to tune in the radio stations you listen to most often.
Note: The frequency is memorized at the same time as the RDS settings that were activated at the time of recording.
Tuning and recording frequencies manually can also be done by activating the AS level.
The settings stored in the memory cells are activated by briefly pressing the number buttons 1-6 (12) after pre-selecting the desired level using the button «AS» (2). Also, if you hold down the button «AS» (2) pressed until you hear a beep, the radio will switch to the AS level and will automatically search for stations, with the settings of 6 of them (with the strongest signal) are stored in the memory cells of the receiver (number buttons (12)).
Note: When this operation is performed, the playback sound is muted. The entry is made only for the AS level.
When you turn on the automatic recording of radio stations in the memory, the RDS function is automatically activated - first all radio stations that support the RDS format are memorized.
If you activate the TP traffic announcement function before activating the automatic station storage function or during the memorization (see above), the radio, after the end of the automatic search, calls the radio station transmitting traffic announcements.
Note: If the TP function is turned on during automatic recording, the automatic channel search operation remains active until at least 1 radio station is found that broadcasts traffic information.
If during the trip the car leaves the coverage area of the transmitting radio stations, the frequencies of which are stored in the system's memory, it is necessary to reconfigure the memory cells to new radio stations.
CD/MP3 player
The CD player can only play normal CDs with a diameter of 12 cm. Do not use discs with paper labels.
Attention: Do not use 8 cm discs or universal digital video discs.
Exposure to direct sunlight may warp the CD.
Attention: The use of CDs of poor quality, warped, dirty, scratched and with holes pierced by a needle may cause the CD player to malfunction!
Note: The player is designed to play all CDs known at the beginning of its sale with the appropriate versions of copy protection. However, this does not guarantee that CDs with new copy protection options will be playable in the future.
MP3 music CDs can be played with the corresponding Infotainment system.
Recommendations for preparing an MP3 CD
Attention: Various programs and devices for laser recording on CD, as well as technology for the production of CD blanks, can lead to problems when playing discs on your player! If you have problems playing your own CDs, change the type of CDs you are using or select a different CD manufacturer.
The authors of this manual recommend the use of CDs with a 74 minute playing time. The CD format must comply with ISO 9660 Level 1 or Level 2. Normal playback of other CD formats is not guaranteed.
Note: When playing multi-session discs, the player only recognizes and plays the first session.
It is not recommended to create more than 20 albums on one MP3 disc (catalogs).
Note: Infotainment system allows individual selection of albums (catalogs).
In turn, each album can contain up to 127 individual tracks and subdirectories, which can be selected individually. The maximum directory depth should not exceed 8 levels.
When using certain CD laser writing software, there may be a numbering inconsistency - in the D01 root directory, either only subdirectories with recordings, or only recordings should be placed.
When burning a disc, each directory and entry can be given a name that can be shown on the infotainment system display - follow the instructions from the manufacturers of the respective software. Note: You cannot use umlauts or special characters when naming directories and entries. In addition, each entry can be assigned a label (ID3 Tag) - it is also displayed. All MP3 files must have the extension «.mp3».
Attention: To avoid errors when playing recordings, do not try to assign extensions to other types of files «.mp3»! Do not use «mixed» CDs containing MP3 records and other types of files! Do not use «mixed» discs containing regular audio recordings and MP3 files.
When generating MP3 files from audio files, the maximum data transfer rate should not exceed 256 kbps.
Activating the CD player
When activated, the infotainment system is activated in CD player mode if it was installed before the system was switched off.
The system can be activated or switched to player mode from radio playback mode by loading a CD. To do this, insert the CD into the drive slot (9) labeled side up, the disc is automatically drawn into the slot and playback of its first recording starts. At the same time, the display shows «Read CD», and then the number of records on the CD is displayed, - the indicator should light up in the display field, depending on the type of disc (CD or MP3).
Attention: Do not use force when inserting the disc into the slot of the receiver - this may lead to failure of the CD player!
To activate the CD player from the radio playback mode with a previously loaded disc, press the button «CD» (6) - the recording that was played the last time the player was used starts playing.
Each time you press the button «CD» (6) the information displayed on the display will change (depending on disk type):
- Audio CD without text. RECORD NUMBER → RECORD NUMBER AND PLAYBACK TIME
- Audio CD with text. REC NAME → ARTIST NAME → REC NUMBER AND PLAYING TIME → DISC NAME → REC NUMBER
- MP3 disc without ID3 labels. FILE NAME → RECORD NUMBER &PLAY TIME → RECORD NUMBER → ALBUM NAME (DIRECTORY NAME)
- MP3 disc with ID3 labels. RECORD NAME → ARTIST NAME → RECORD NUMBER AND PLAYING TIME → ALBUM NAME → RECORD NUMBER
Search for music tracks
Each press on the right sector of the button of the 4-position switch (14) during CD playback will automatically skip to the beginning of the next music track.
With a single press on the left sector of the button of the 4-position switch (14) the player will start playing the current track from the beginning. By successive pressing this button, you can return the player to the beginning of one of the previous records.
When searching for music tracks, playback sound is muted.
Holding down the corresponding sector of the 4-way selector button causes the disc to play fast forward or backward. When the button is released, the player will return to normal playback.
Replaying a Recording (Repeat)
The Repeat function allows you to play the current disc recording repeatedly - the recording will be repeated from the beginning until the function is canceled. To activate the function, briefly press the lower sector of the button of the 4-position switch (14), - the display will show «Repeat».
Note: When playing an MP3 disc, you need to hold the button a little longer.
To cancel the function, press the same sector of the button again (14) or choose a new CD entry (see above).
Scanning the initial fragments of records (Intro Scan)
The Intro Scan feature allows you to play the beginning of each audio track for 10 seconds for a quick look at the disc recordings.
To activate the function, briefly press the upper sector of the button of the 4-position switch (14), - the display will show «Scan Tracks».
Note: When playing an MP3 disc, you need to hold the button a little longer.
To cancel the function before the end of viewing all records, you must again press the same sector of the button (14) or choose a new CD entry (see above).
Selecting an album on an MP3 disc (with appropriate equipment)
When playing an MP3 disc containing multiple albums (catalogs) album selection is made by successive short presses on the upper/lower sector of the button of the 4-position switch (14) until the name of the desired album appears on the display.
Note: All albums that do not contain MP3 files are automatically skipped.
When an album is selected, the name of the first track in that album will appear on the display and playback will begin.
Shuffle Playback (Random)
this function allows you to change the playback order of the loaded CD tracks in random order, to activate the function, you must press and hold the button «SO» (6) until the display shows «Random». Then pressing the top / bottom sector of the button of the 4-position switch (14) select the appropriate setting:
For audio CD:
- Random on - the function of playing in random order is activated;
- Random off - cancel the function - play the records in the usual sequence.
For MP3 CDs (with appropriate equipment):
- Random Album - play in a random sequence of records of the current album;
- Random CD - playback in a random sequence of records from all albums recorded on this disc;
- Random Off - cancel the function - play the records in the usual sequence.
When the Random function is activated, the message appears on the display «RDM».
Ejecting a CD
The CD is ejected by pressing the button (3), - the inscription will appear in the display field «Eject CD» and the audio system will start playing the last tuned radio station in radio mode.
Note: The CD can also be removed when the audio system is turned off - the system is activated for a while and turns off again after removing the disc.
If within 10 seconds the disc is not removed from the slot of the receiver, it is automatically drawn back.
Remote controls (DU) audio system
On models of the corresponding configuration, the main functions of the audio system can be controlled remotely from the buttons located on the steering wheel. The placement and designation of the buttons is shown in illustration 19.2, which includes all links in the text.
19.2. Location of audio remote control buttons
Below is a description of the functions performed by each of the remote control buttons:
Button (26)
This button, when the system is equipped with a TIG information display, in radio playback mode allows you to tune in to a radio station broadcasting at a higher frequency, and in CD playback mode, switch to playing the next record.
When equipped with a GID display, the button (26) used to move the cursor left or up.
Button (27)
This button, when the system is equipped with a TIG information display, in radio playback mode allows you to tune in to a radio station broadcasting at a lower frequency, and in CD playback mode, switch to playing the previous record.
When equipped with a GID display, the button (26) used to move the cursor to the right or down.
Button (28)
When this button is pressed while operating a system equipped with a three-function display (TID), radio playback mode switches to the next preset radio station, and audio CD playback mode starts disc playback from the first track.
Note: There is no MP3 disc playback control function.
When operating the on-board computer on systems with a GID display, pressing the button enters the computer menu and confirms the menu item selection.
Note: On models equipped with an on-board computer and a graphical information display, when the radio or CD player is operating, the buttons (26), (27) And (28) do not perform any function.
Button (22)
This button selects the playback mode of the audio system - with each press, the system will switch from the radio playback mode to the CD player mode and vice versa.
Buttons (30) «-» And (31) «+»
When you click on the corresponding button, the playback volume will increase or decrease.
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