Volume Adjustment; Decrease The Volume Quickly; Switch Audio Source; Set The Mixing Mode - Alpine HDS-990 Owner's Manual

1.4 Select Format
*1
file format list, turn the knob to select the
desired file format, short press to enter
the song list.
1.5 Select Date , short press to enter the
*2
song list.
1.6 Select Size , short press to enter the song
*3
list.
*1 Sort by numbers 0 → 9, A → Z
alphabetically (first by numbers, then by
letters, uppercase and lowercase letters
are indistinguishable).
*2 The date is arranged in the order of new
→ old of the actual modification date of
the file, and there is no rule for the same
time.
*3 File sizes are arranged in the order of
largest→smallest occupied storage space,
and there are no rules for the same size.
3
Under the song list, turn the knob to select
the desired song, and 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 not be displayed.
When there are a lot of songs stored in the

USB, the search may be slower.

Volume Adjustment

Turn the knob until you get the desired volume.
Volume: 0~35

Decrease the Volume Quickly

The mute function can instantly reduce the
volume to 0.
1
Press the (Mute) button to activate the
mute mode.
The volume will be 0.
2
Press the (Mute) button again to
restore the previous volume.

Switch Audio Source

Short press to switch the signal source.
10 EN
, short press to enter the USB (default audio source)↔BT Audio
*1
level↔AUX↔USB Audio
*1 When three USB storage devices are
connected to this unit, the audio files in
them will be combined and played in the
same USB audio source.
*2 Only displayed when "Bluetooth" is
connected,
Bluetooth".
*3 USB Audio and BT Audio are mutually
exclusive and cannot be superimposed,
otherwise the auxiliary source will be
invalid.

Set the Mixing Mode

This machine is preset with a high-quality
audio processing chip. You can choose ALPINE
Direct mode to enjoy the high-quality signal
source of this unit, and you can also choose
AUX Mix mode to listen to the sound of the
original car equipment (such as navigation)
while enjoying the signal source of this unit.
Long press to switch the mixing mode,
take AUX Mix as an example:
AUX Mix↔ALPINE Direct
AUX Mix：
When the machine is playing music, the music
that the original car audio is playing, the
navigation prompt sound, etc. are mixed and
played together.
ALPINE Direct：
Only enjoy the high-quality music brought to
you by HDS-990.
When the same

superimposed, the auxiliary sound source is
invalid. That is, when the current signal
source is AUX, the AUX mixing mode is
invalid.
Before using this function, you need to

correctly connect the audio output of the
original car audio to the AUX IN interface of
the unit.
↔High
*2
*3
see "Connecting
sound source
to
is