Thanks once again for such a good answer.
The people at Gigabyte being really unhelpful. I asked them further into my problem and still they always send me the same answers. Got this reply this morning from them:
''Hello,
Please suggest:
1. Update latest BIOS
Z170XDesignare.zip
2. Update latest driver from our website
http://www.gigabyte.com/Motherboard/GA…v-10#support-dl
3. Suggest check if any different when connect speaker on Front and Rear Audio. ''
And yes, I would ideally want to skip selling my two computers to buy a single MBP. One option is to track all electric guitars with my MBP and then mixing/editing in my Hackintosh but that seems kind of a hassle and could be annoying work flow.
I'm really busy today but tomorrow or wednesday I will record both audio and video of this issue. But just to add more information, if I turn off my computer and monitor through the UAD OR Kemper headphone plug I don't get any noise. So its not the UAD and it's not the Kemper making this problem. It's definitely the computer