Have you tried using another computer? It could be the USB isn't providing adequate power to the DDJ-400, and when you send that second audio signal, the required power is not available, causing the drop in level.
Pioneer DDJ 400(Issue with headphones output when loading a second track)
I have problem with the headphones output on my DDJ 400(Rekordbox)
Once i load a track and start playing, the cue work as it should(Both knobs are set at top. (Headphones sound is 100%) But once i load up a second track my headphones sound suddenly drop alot, making it impossible to hear anything
These are my settings.
I only run a USB to my computer, which is connected to my speakers.
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