Recently bought a Asus Xonar DS 7.1 PCI Sound Card to try to fix an issue with my microphone, slight buzzing in background, after buying this and plugging my audio splitter connected to my senheiser pc360 and my speakers i found there was a slight more refined buzzing, after trying to change the power supply the tower was connected to which seemed to slightly help, I then tried connecting my speakers to my sound card and the headset to on board audio therefore getting rid of the audio splitter, which seemed to get rid of the static, my question is whether there is a way to use on board sound for both my speakers and headset without using an audio jack and also why this problem even happens.