Pioneer Dj DDJ-FLX4 Portable 2-Channel rekordbox DJ and Serato Controller (Graphite) - Manual (Page 151)

Additional information
151
En
 The [IN] button and [OUT] button on both decks flash and don't
work.
• The supply capacity of the USB power adapter or mobile battery
connected to the unit's USB port (for power supply) may be
insufficient. Use a device with DC 9V 3A.
Connection
 The unit isn’t recognized by your PC/Mac.
• Connect the supplied USB cable correctly. See: Connections
(page 37)
• When using a USB hub, be sure it's a product recommended by the
manufacturer of your PC/Mac.
• Quit any other open applications including screen savers and
antivirus security software on your PC/Mac. (When quitting antivirus
security software, before doing so, disable the internet connection to
ensure the security of your PC/Mac.)
• Disconnect any external hard disk, keyboard, etc. Use the internal
hard disk only.
• If your PC/Mac has multiple USB ports, try connecting to another
one.
• For Mac, launch the macOS utility software [Audio MIDI Setup] , and
click [Windows] on the menu bar and check that > [Show Audio
Devices] > [DDJ-FLX4 Audio Out] is displayed.
• For Mac, the sound setting may not be correct. Disconnect the USB
cable, launch the macOS utility software
[Audio MIDI Setup] , and
display [MIDI Window] or [MIDI Studio] . Select the [DDJ-FLX4]
icon, and click [Remove Device] . (The icon may be [USB MIDI
Device] instead of [DDJ-FLX4] . In this case, select [USB MIDI
Device] .) Connect the unit with the USB cable again. The [DDJ-
FLX4] icon is displayed.
• For Windows, check that [DDJ-FLX4] is displayed under [Device
Manager] > [Sound, video and game controllers] .