If you have it connected to any kind of home theatre amplifier or speaker system which has audio processing, we recommend disabling those additional sound features to use a "direct" output instead.
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The only thing I have it connected to is a soundblaster external soundcard. It's been connected to this since new.
And does that soundcard then route the audio internally and then back out to speakers? Because that in itself would add latency to the audio.
OK I think I have sorted it. I was trying to use my external soundcard rather than the built in one. I always used the built in soundcard previously. I'll go back to the ddj-400 soundcard.
Ah, yes, that would possibly be the issue!