splitting audio for headset and speakers

But if I did get another external sound card, would any really do? Just as long as it plugs into the USB port with a headphone jack, right? But heres where i get kind of lost in theory. Ive tried messing a bit with the settings, but nothing really seems to be working all that well.

Because if I do plug headphones in front, the sound will mute the speakers. Now the headphone jack on the front of my PC you would think it would be an onboard soundcard, and the 4.1 in back would be seperate, but now I am thinking that isnt the case. Now I am well aware this topic has been brought up many times, but I feel like mine problem is slightly different. But I just cant friggin figure out how to split the two for previewing before they go live. I am using a desktop PC with a sound blaster 4.1 surroud card in back, and even the front of my PC has a headphone jack and my lycosa keyboard has a headphone jack as well. Super fun! Ive really been digging it, however it has become very difficult because I basically have to guess where drops come in and what not. But I had some money to blow before taxes come in, so I decided to blow it on VDJ pro.

Howdy! Okay, so I am super new to mixing.

Splitting audio for headset and speakers