Is this what I need right here? USB 2.0 3D Virtual 7.1 Ch Audio Sound Card External | eBay
It seems so cheap and simple that I may need something more complex then that.
Looking for input!
I testing a few USB cards on my Linux box, and found that the ones advertised as 7.1 channel were compatible, where I couldn't get the others to work on Linux.
Out of the 5 purchased, a couple of them had a background squeal before applying audio. That was unacceptable to me, so I junked those. The other 3 worked great.
Also keep in mind, that these USB cards expect a microphone input and don't have a line input jack, so you may need to build an external circuit to cool off the audio going into the sound card.
You'll need 3 conductor plugs for these jacks. After days of pulling my hair out, I finally figured out that the jacks on these cards are wired in way that shorts the audio going in if a 2 conductor plug is used.
Another problem I encountered was the numbering assignments by the operating system wasn't consistent after a reboot. What may have been "card 2" before reboot, might be "card 1" after rebooting.
My simple solution to this problem was to just pull all the sound cards before rebooting, then re-insert one at a time in the order I want them, after the system boots back up.
In addition, the USB cards themselves may crowd each other when plugged in side-by-side. This crowding causes the buttons on one or more of the cards to be depressed by the adjacent card. If you have to buy a USB hub, consider the extra elbow room needed by the cards when making your selection. You may need to purchase a short length USB extension dongle to solve this problem.
I realize that you may be running another operating system, so the problems I encountered may or may not even apply to you.