Just bought the S4 and I want to connect it to my logitech z-5500 computer speakers. On virtual DJ it was possible to choose the computer (through USB) as the output for the sound and still be able to cue listen in the headphones connected to the device. This doesn't seem possible on the Traktor S4, right? How do I solve this? The z-5500s only has digital inputs. So I cant connect 2 RCA cables to it and get full sound. Is there perhaps a soundcard I can buy that manages this? The z-5500 looks like this at the back: Thanks for any help!