Sound is not output or the sound is low.

1) Are the channel faders, crossfader, and [MASTER LEVEL] control set to the proper positions?

Set the channel faders, crossfader, and [MASTER LEVEL] control to the proper positions.

2) Is the connected power amplifier, powered speakers, etc. set properly?

Set the external input selection and volume on the power amplifier, powered speakers, etc. properly.

3) Is the included USB cable connected properly? (When combined with computer)

Connect the included USB cable properly.

4) Is the cable included with the iPhone/iPad connected properly? (When combined with iPhone/iPad)

Connect the cable included with the iPhone/iPad properly.

5) Are terminals or plugs dirty?

Wipe any dirt off terminals and plugs before making connections.

6) Is the driver software set properly? (Windows only)

Set the driver software properly. (With OS X, driver software is not necessary.)