1.4 Select Format
*1
, short press to enter the
file format list, turn the knob to s elect t he
desired file format, short press to enter
the s ong list.
1.5 Select Date
*2
, short press to ent er the
song list.
1.6 S elect S ize
*3
, sh ort press to enter the song
list.
*1 S ort by numbers 0 → 9, A → Z
alphabetically (first by numbers, t hen by
letters, uppercase and lowercase letters
are indistinguisha ble).
*2 The date is arranged in the order of new
→ old of th e actual modification date of
the file, and there is no rule for th e same
time.
*3 File sizes are arranged in the order of
largest→s malle st occupie d storage s pace,
and t here are no rules for the same size.
3 Under the song list, turn the knob to select
the desired song, a nd short press to start
playing the selected song.
Press to return to the previous level.
Empty files or files with no valid play files
will n ot be displ ayed.
When there are a lot of songs stored in the
USB, the search may be slower.
Volume Adjustment
Turn th e knob unti l y ou get the desired volum e.
Volume: 0~35
Decrease the Volume Q uickly
The mute funct ion ca n instantly reduce the
volume to 0.
1 Press the (M ute) button to activate the
mute mode.
The volum e will be 0.
2 Press the (Mute) button again to
restore th e previous volume.
Switch Audio S ource
Short press to switch the signal source.
USB
*1
(default audio source)↔ BT Audio
*2
↔ Hig h
level↔AUX↔USB Audio
*3
*1 When three USB storage devices are
connected to th is unit, the audio files in
them will be combined a nd played in th e
same USB audio source.
*2 O nly displ ayed when "Blu etooth" is
connected, see "Connecting to
Bluetooth".
*3 USB Audio and BT Audio are mutually
exclusive and cannot be superimposed ,
otherwise t he auxiliar y source will be
invalid.
Set the Mixing Mode
This mac hine is preset with a high-quality
audio processing chip. You can choose ALPINE
Direct mode to enjoy the high-qualit y signal
source of this unit, and you can also choose
AUX Mix mo de to listen to the sound of t he
original car equ ipment (such as n avigation)
while enj oying the signal source of t his unit.
Long press to switch the mixin g mode,
take AUX Mix as an example:
AUX Mix↔ALPINE Direct
AUX Mix：
When th e machine is playing music, the music
that the original car audio is playin g, the
navigation prompt sound, etc. are mixed and
played together.
ALPINE Direct：
Only enjoy the high-quality music brought to
you by HDS-9 90.
When the same sound sou rce is
superimposed, the auxil iary sound source is
invalid. Th at i s, when t he current sig nal
source is AUX, the AUX mixing mode is
invalid.
Before using this fun ction, you need to
correctly connect the audio output of the
original car audio to the AUX IN interface of
the unit .
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