Currently I only get both tracks on the headphones, but no trace on my normal laptop speakers. I was already on "config", where I set up 2 sound cards as well as Master: First card; Headphones: Second card
And then stop Primary Sound Operators and Speakers. But whatever I do, both tracks come up on the headphones and none on the laptop.
I have not made any simple mistakes, but I'm open to any answer.
Unfortunately, it is not possible to answer this question. Because you do not call unfortunately the entire setup. All you can read is that you use a headset and a laptop with Virtual DJ. That's all? Faslls yes, it is not uncommon that the setup does not want to work in your sense. Almost all computers can only control one sound card at a time. Therefore, one usually uses a MIDI controller, which has an interface (ie a sound card) installed. The controller then connects both the speakers and the headphones.