OPERATION MANUAL
GROM-MST4
MP3 USB Android iPhone car stereo adapter kit
for fiber-optic stereos
Optional Bluetooth and AUX-in extensions
MODEL: GROM-MST4-VOLS
Fits to the following makes:
Volvo S40 2005-2012 Single CD
Volvo V50 2006-2012 Single CD
Volvo C70 2006-2012 Single CD
Volvo S60 2010-2012 Single CD
Volvo XC90 2007-2013 Single CD
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1. EXT1-EXT2 PORTS - Accessories Cables Connection
Connect the cables to the appropriate slots available on GROM-MST4 (see above illustration).
EXT1- connect GROM Bluetooth Dongle
EXT2- connect GROM Bluetooth Dongle or AUX-In 3.5mm cable
Note: You can connect GROM Bluetooth Dongle to either the EXT1 or EXT2, and AUX cable only to the EXT2.
2. Differences between Single CD and 6CD stereos
Volvo XC90 2007-2013 and Volvo S40/S60/V50 Single CD and 6CD stereos may look similar or exactly the same. But Single
CD stereo requires different firmware flashed on the GROM main unit. If you have 6 CD stereo, please update your firmware
to the correct one at http://www.gromaudio.com/software.html and refer to the usage manual for Volvo 6CD stereos.
3. Quick operation steps
3.1 MODE Selection
1. Press Mode/CD to enter GROM mode
2. You will be using Tuning/Selector knob to switch between MODES (USB and AUX).
TRACK 20 = USB Mode.
TRACK 60 = EXT2 or AUX MODE (AUXILIARY will appear on the display). Turn right Tuning knob > 20 tracks to switch to
back to USB.
3. You can also use EJECT button to switch between the MODES. Press the EJECT button and it will jump between
TRACK 20 and TRACK 60 without much effort. GROM will announce its current mode.
3.2 Quick button operation for Volvo Single CD
1. Press < or > button to change tracks
2. On the Single CD stereo you can create up to 59 Folders/Playlists with unlimited number of tracks on your USB memory
device, Android device, iPod or iPhone.
3. Track Time will show FOLDER and TRACK numbers. Minutes = Folder Number, Seconds = Track Number.
4. To change Folders/Playlists use Tuning/Selector knob. Turn Tuning knob clockwise 10-19 tracks to jump into the next
Folder/Playlist. If you want to go to the previous Folder/Playlist, turn the Selector/Tuning knob clock counter wise for -10-19
tracks.
4. USB MODE - Android Operation
4.1 Android Device Setup and Operation
The GROM-MST4 adapter when in USB mode allows you to connect your Android device directly to the GROM-MST4 USB
port. You will need the GROM AALinQ app available on the Google Play store / Android marketplace (search for AALinQ) .
Once you have AALinQ installed on your Android device, you can connect your Android to the USB port using your own or
provided USB Android connector cable.
Depending on the version of your Android software and the phone model, you might need to disable or enable the USB
Debugging option on your phone. If you plugged in your Android phone to the GROM device, and your adapter is not
working, please go to the phone settings and either enable or disable the USB Debugging function.
1. To enable/disable USB Debugging, on Android device go to Settings Applications Development
2. Once you connect your Android device to GROM-MST4 and the GROM unit is in USB playback mode, AALinQ should
automatically start playing a song from your Android device.
4.2 AALinQ operation with the GROM-MST4-VOLS
Android and USB stick functionality is essentially identical. Playlists on AALinQ will be mapped to Discs on the stereo. Skip
tracks, change disc, fast forward, random, scan controls are identical to USB controls. Text of current song is displayed.
Disc 1 will play “On The Go” playlist on the AALinQ app. Disc 2 or higher are your other playlists.
The playlists are assigned to the certain Disc according to the time of playlist creation.
Troubleshooting:
Symptom Cause Remedy
No music is coming from the
car speakers or sound is
distorted
You can’t hear the music in
AALinQ
Music is not playing You do not have USB Debugging
5. USB MODE – USB stick / flash drive / external hard drive operation
5.1 Supported USB Storage Devices
All FAT16/32 formatted storages:
- USB sticks/hard drives
GROM-MST4 is in the wrong
mode
An empty album or playlist is
selected on the AALinQ
enabled, and your Android is 2.3
and newer
Make sure that you are in the USB playback mode
Make sure that you select a playlist that has songs and
it is not empty.
To enable/disable USB Debugging, on Android device
go to Settings Applications Development
The GROM USB supports only FAT / FAT16 / FAT32 formatted storages. NTFS or exFAT are not supported!
5.2 Supported formats
The GROM-USB supports the following formats:
- FLAC lossless
- MP3 with bitrates up to 320Kbps
- WMA with bitrates up to 389Kbps
- AAC / iTunes with bitrates up to 389Kbps
- OGG/Vorbis with bitrates up to 389Kbps
- VBR/CBR
Note 1: No digital rights management (DRM)-protected content will play directly through the GROM-MST4 adapter as such
content is encrypted and signed by the media publisher. You need to burn such files to a CD and then rip them back with any
capable software.
Note 2: AAC files stored on USB Flash Drives may have a delay of 5-10 seconds before the music starts playing.
5.3 USB Directories/Folders Setup
- You must set up the PLAYLISTS (FOLDERS/DIRECTORIES) on your USB device. You will need to set up at least one
playlist. Without playlists the USB interface will not play the music.
- Create one directory (folder) for each disc your stereo supports. For Volvo with Single CD you can create up to 59
folders/playlists, and there is no limit for the number of the tracks in each folder.
- Name them with numbers (i.e., 1-Pop, 2-Rock, 3-Classic, etc); save all of your music into these directories.
- As soon as you connect the GROM-MST4 adapter to a USB portable data medium, GROM will translate root directories
into virtual discs.
- We recommend that you have as many directories as possible on a root level as the car stereo will not recognize
subdirectories. The GROM itself will enumerate subdirectories and turn them into a flat list of tracks.
- If filenames in a certain directory begin with digits, they will be played in ascending order based on the order of those digits
in the filenames. For example:
\1-Dance\My songs\
1. Track.mp3
2. Track.mp3 (will play first according to the number )
- If filenames begin with letters, they are played in ascending order of the file creation date/time.
- If root directory starts with the number, the directory will be assigned to a respective virtual disc.
All MP3, WMA, iTunes, FLAC and OGG tracks will be enumerated and found once you select the appropriate disc.
Check USB Drive Setup guide at http://gromaudio.com/docs/Grom_USB_Setup.pdf
5.4 USB Basic Features
The GROM-MST4 adapter has the following functionality:
- Every directory in a root of the USB portable data medium becomes a virtual disc. Playlist on Android become virtual
disc. Please note: directories with non-audio files (e.g., pictures, documents) located in the root will be recognized
as empty virtual discs.
- All audio files within the root directory are enumerated and treated as TRACKS.
- The following operations are supported by the GROM-MST4:
o Change virtual disc/playlist
o Change tracks forward and backward
o Display track # and track title where available
o Restore last positions for up to 4 USB sticks
o Restore last playlist positions in up to 20 virtual discs
6. iPod/iPhone/iPad operation with USB to iPod cable
Once in the USB mode of GROM with iPod/iPhone/iPad plugged into to USB port of GROM the following operation are
available:
A. Simple mode (iPod stays unlocked) :
1. Single CD stereo: turn Tuning knob to the left <10 tracks creates Simple iPod Mode (Disc №1).
iPod stays unlocked. Your iPod can be controlled via its clickwheel or via car stereo controls. The information displayed on
your car stereo does not represent the actual song position on the iPod (the song’s number). There is no need to prepare
your iPod to play in this mode.
2. Available operations:
- Next track – use > button or turn Tuning knob to the right
- Previous track – use < button or turn Tuning knob to the left
- Fast Forward –press and hold > button
- Fast Reverse –press and hold < button
B. Advanced mode:
1. Single CD stereo: Turn Tuning knob to the right + 10-19 tracks will create Advanced iPod Mode Folder/Playlist 1
Your iPod is locked for control and only operated via car stereo buttons. Your iPhone or iPad stays unlocked in Advanced
mode. You can see current information such as track time, number and playlist (disk) number. Text is also available for
certain stereos. In order to use this mode you have to prepare your iPod as explained later.
The advanced mode is always on for playlists 2 and up.
2. “Ok to disconnect” is shown on the iPod display while it is connected to this unit. The clickwheel of the
iPod is disabled when in this mode.
3. Available operations:
- Next track
- Previous track
- Next Playlist/Folder
- Previous Playlist/Folder
4. Playlist set up for Advanced Mode
To use your iPod in Advanced Mode you have to define playlists. We recommend naming the playlists starting with the
number according to the desirable disk position.
1. Andy’s songs
2. Kids
3. Disco dance
4. Favorites
5. House rhythms and so on.
If your iPod does not have playlists/songs it may cause unpredictable outcomes and improper operation of the unit.
EMPTY PLAYLISTS MAY ALSO CAUSE UNPREDICTABLE BEHAVIOURS, ESPECIALLY EMPTY PLAYLISTS THAT
ARE LOCATED IN THE MIDDLE OF ALL OTHER PLAYLISTS.
C. WHEN THE CAR IGNITION IS OFF
When you turn your car stereo or car ignition off, the iPod will automatically will go into sleep mode. In the sleep mode, the
iPod will still consume power—although very little—from the car battery. There is no need to disconnect the iPod every time
you turn off your car.
However, it is strongly advised that you disconnect the iPod if you do not plan to operate your car for one week or
more.
7. USB, Android and iPod MODE Operation Troubleshooting
Symptom Cause Remedy
No music is coming from the
speaker
The music is distorted. GROM-MST4 is in the wrong
You can hear the music from
the iPod but you can’t control it
from the stereo
You can’t hear the music from
USB, Android or iPod
The music is distorted EQ or BASS boost options are
The player is skipping the
playlists on USB
GROM-MST4 is in the wrong
mode
mode
iPod needs to be reset Reset the iPod (resetting will not erase your music, it
An empty album or playlist is
selected on the USB, Android or
iPod
turned ON on the iPod
You have empty playlists Make sure there is no empty playlists on the USB drive
Make sure that the correct mode (USB or AUX) is
selected. Please refer to the chapters 2-3 of this
manual.
Make sure that the correct mode (USB or AUX) is
selected. Please refer to the chapters 2-3 of this
manual.
will only restart the iPod)
Make sure that the non-empty album or playlist is
selected on the USB or iPod
Make sure all EQ and BASS boost options are turned
OFF on your iPod
8. Bluetooth and AUX-IN
Note: Bluetooth Dongle and AUX cable are sold separately.
In the AUX mode you can connect any audio source via GROM MiniDin to 3.5mm phone jack cable.
8.1 AUX-IN input
You can connect any audio source via GROM MiniDin to 3.5mm phone jack cable (please refer to the section 1.8 of Install
Manual, “optional accessories”). The GROM 3.5mm cable connects to the EXT2 port on the GROM-MST4 adapter and
provides AUX-IN for any audio device. The charging USB connector on the GROM auxiliary cable (if available) provides 5V
USB charging for most mobile devices.
To start using GROM as the auxiliary adapter, simply connect your audio source to the 3.5mm phone jack (EXT2) and then
turn the audio source ON. Your stereo should be in the AUX GROM mode. Please refer to the Chapter 3.1 of this manual on
the MODE changes.
If the stereo is ON and in the CORRECT MODE – the device will be ready to play. You can control the connected device
using its own controls. Please regulate and adjust the volume on the connected device for proper audio levels.
You can connect MP3/DVD player, Satellite and many other audio devices that have 3.5 mm plug. If your device has a
different type of connector (RCA, 2.5mm, etc.) you can buy an extension adapter at your local stereo store or on GROM
website.
Note: When the ignition is OFF the adapter will not automatically shut down the AUX-IN device. Please make sure to turn off
the AUX-IN audio source manually. If you plan not to operate your car for one week and more, please disconnect AUX-IN
audio source from the adapter. When you are using GROM-USB in a different mode other than AUX, please turn off AUX-IN
audio source.
8.2 BLUETOOTH Dongle
You can also connect GROM Bluetooth Dongle (GROM-BTD) to the EXT1 or EXT2 port on the GROM-MST4 adapter for the
hands free use of your mobile phone and wireless music play. Please refer to the GROM Bluetooth Dongle manual that is
supplied with your Bluetooth Dongle. You can also access the manual online at GROM Audio website:
http://gromaudio.com/docs/bluetooth_manual.pdf.
If for some reason you need to reset the Bluetooth:
A. For Volvo S40/S60/V50/XC90 Single CD with SCAN button available:
To reset GROM-BTD memory, go to FM, then go to CD and press the SCAN function of the stereo 1-2 times. Should hear 2
low beeps from the speakers indicating reset. If your phone was connected to grom-car, when you do the reset it will
disconnect from Bluetooth. If you have an old grom-car on the Bluetooth menu of your phone delete it, a new grom-car will
pop up after the reset.
B. For Volvo S40/S60/V50/XC90 Single CD with SCAN function available in the menu:
It is easiest to save the SCAN function to your MYKEY button.
In CD mode, go the scan function in your stereo, press and hold MYKEY for a few seconds. Screen should say the function
has been saved to mykey.
Then you can go to FM, then back to CD, then press MYKEY 1-2 times for the reset.
9. Support and Warranty
For technical support, please visit http://gromaudio.com/support.html and fill in the web form. The first available
representative will answer your question.
For warranty information please refer to your Installation Manual.
iPod®, iPhone®, iPad® are registered trademarks of Apple, Inc, and in no way associated with GROM Audio. Android® is the registered trademark of Google,
Inc, and in no way associated with GROM Audio. All trademarks used in this booklet are the property of their respective owners, and are in no way associated
with GROM Audio.
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