Alpine HDS-990 HDS-990 Owners Manual - Page 13

1.4 Select Format*1, short press to enter the file format list, turn the knob to select the desired file format, short press to enter the song list. 1.5 Select Date*2, short press to enter the song list. 1.6 Select Size*3, short press to enter the song 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 10 EN to switch the signal source. USB*1(default audio source)↔BT Audio*2↔High level↔AUX↔USB Audio*3 *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, see "Connecting to 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 sound source is 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.