USB Audio Not Working - High Sierra 10.13.6

USB Audio Not Working - High Sierra 10.13.6

I have a fresh High Sierra Install, my hardware looks as followed:

CPU : Intel - Core i7-8700K

CPU Cooler : Corsair - H100i v2

Motherboard : MSI - Z370M GAMING PRO AC (Realtek® ALC1220 Codec)

Memory : ADATA - 32GB (2 x 16GB) DDR4-3000 Memory

Storage : 2x Samsung - 970 EVO 500GB

Video Card : MSI - GeForce GTX 1080 Ti 11GB ARMOR Video Card

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Headphone jack is working for audio. I have tried multiple USB audio interfaces so the interface is not the issue (also works fine in Windows). All other USB devices are working.

The model of the interface is Mackie Big Knob Studio:

The device shows in sound preferences:

https://preview.redd.it/zwmr88kt0w441.png?width=663&format=png&auto=webp&s=7e8eaddd02eab472669d066261a653219cc61f5b

My Kexts/Other folder looks like this:

https://preview.redd.it/seyd0f2x0w441.png?width=782&format=png&auto=webp&s=3e7edef72b8f7bb03e18a3a7ec2280bb9b38e1f8

I have injected audio layout 1 as this has worked for my hardware in the past, also is supported by my codec, referenced here. I have also tested the other layouts as well.

https://preview.redd.it/yt9b3aqq1w441.png?width=1502&format=png&auto=webp&s=1dfda548471f32969e4119ef77deaaf1e1027711

Since this is a fresh install I assume I am missing a kext in S/L/E or L/E but I could be wrong. I feel like most posts regarding this issue are outdated so I was hoping to gain some knowledge on the issue here, and help some people out in the future with the post. Thanks much!

EDIT: My Audio Midi Setup for the interface:

https://preview.redd.it/jnex1c8acw441.png?width=444&format=png&auto=webp&s=8ecd19509f8a5871498c40fcf885d4bbd611052d

https://preview.redd.it/zcgda8ojcw441.png?width=482&format=png&auto=webp&s=5d84b6a213dce52348feea04afe6177977126618

submitted by /u/isaiiah
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