DDJ-SX with Receiver VSX 421

Ladies and Gentlemen, I am using the Pioneer DDJ-SX with my PC (with extra soundcard) and with the Pioneer VSX 421 Receiver where my Speakers are connected to, plus headphones DT 770. My problem is that I dont get any sound due to the DJ Controller. I guess the Problem could be the sound drivers, because i got 3 Sound driver installed (from soundcard, from Monitor, and the ASIO from the controller). But the driver is correctly selected and I also reinstalled the ASIO driver but still i got no outcoming sound at all. I also thought it might be a Problem to use the controller with the AV-Receiver instead of powered Speakers? Maybe someone has a clue? Best regards