If you can’t send or receive audio signals between DUAL CUBE LX and an iOS device (iPad/iPhone) connected to the USB port (of the DUAL CUBE LX), check the following points.
Specifying the USB driver
To send and receive USB audio between this unit and an iOS device connected via USB, you must use the standard USB driver settings for the OS. Set the [AMP TYPE] knob to “JC CLEAN”, and turn on the power while holding down the [MEMORY] button.
USB cable-related problems
Audio signals cannot be sent or received if the USB cable is malfunctioning. Try using a different USB cable.
Audio settings (if the audio from the DUAL CUBE LX can’t be heard from your iOS device)
When you use the standard USB driver included with the OS, effects are applied to the GUITAR/STEREO IN L, R audio that is output. Check whether the GAIN, VOLUME and EQUALIZER have not been turned down.