When I export loops from Ditto X2 to my computer which I play in a media player like VLC, the volume of the track is quite low. What can I do to boost the volume of the exported backing track when played on the computer to be louder?
You have to know that the Ditto maintains the signal level as it gets from its input. The level knob acts only on the output both for loops or track level.
Please try to boost your signal to the input of the Ditto using a booster pedal or a preamp. Another option is to normalize the signal once you've exported the audio file on your computer with the help of an audio editor like Wavelab, Audacity, Soundforge, etc.