Elgato HD60 Pro not showing up in playback devices/recording devices.

Hello everyone. I am trying to stream a Duo PC setup using the Elgato HD60 Pro. I have set everything up far enough to where I can stream video just fine at 720p/60fps. I have tested it and it is great! I am using OBS (Open Broadcaster Software) to do the broadcasting and it is doing a fantastic job streaming the video. Now my only issue I have left is the audio transmission. This I know I have to use Virtual Audio cable according to several tutorials and what not. In those tutorials they instruct you to open up your recording devices on windows (I'm using windows 7 on both pcs) and to right the area and in the menu that pops up you need to select both "Show Disabled Devices" and "Show Disconnected Devices" which I did. Then you are to right click the device that shows up "Stereo Mix" (which was hidden before) and enable it. After that, you right click "Stereo Mix" again, go into properties where you enter the "Listen" tab, check the box "Listen to this device" and click the drop down box directly under that, titled as "Playback through this device", and a list drops down with your playback devices to select from. You are to select you capture card in this step where mine would be named something like "1-Elgato HD60 Pro Capture Device" or something like that. Here is where I have my issue. My capture card does not show up here. It doesn't even show up in the "Playback Device" list of the main sound window. Like I mentioned, I made sure that I have the "Show Disabled Devices" and the "Show Disconnected Devices" settings checked and therefore my Elgato HD60 Pro is not recognized as an audio device at the moment. I see in videos that other users don't have this problem where it doesn't seem to be a common one and so this issue of mine is not explained or instructed anywhere from the videos and forum posts I've seen. I am really hoping it is a simple mistake that I made or something that needs to be configured that I haven't yet.

I can explain the way I have my cables.

■ Gaming PC GPU =----{HDMI}----= Streaming PC Elgato (IN)

■ Gaming PC GPU =----{Display Port}----= Main monitor

■ Streaming PC GPU =----{HDMI}----= Secondary monitor

■ Streaming PC Elgato (OUT) =----{HDMI}----= Secondary monitor

I will list both of my PC specs below.

Gaming PC:

■ Intel i7-4790k
■ EVGA GeForce GTX 980 04G-P4-2983-KR 4GB
■ G.Skill 16GB DDR3 RAM
■ Asrock Z97 OC Formula
■ EVGA 1000w PSU Plat. certified
■ Samsung 840 EVO 500GB SSD.

Streaming PC:

■ Intel i7-5930k
■ XFX Radeon R7 360 DirectX 12 R7-360P-2SF5 2GB
■ ASRock X99 Extreme4 LGA 2011-v3
■ G.Skill 16GB DDR4 RAM
■ Samsung 950 PRO M.2 512GB SSD
■ XFX 650w PSU Gold certified

Both system are running on Windows 7 64-Bit Operating systems.

If more system info is needed let me know. Thank you! I hope we can figure this out!