If the sound card is compatible with Linux (should be), then all you need is disable the on-board sound card and it should be automatically used.
Some details, added over time by various RetroPie users, are in Sound docs.

Glad you got it working.
You can mark the topic solved by editing your first post in the topic.

@blackjackpsp good to see you have found a workaround as solution. If you think this topic can be marked as solved please do adapt the subject of your inititial post (e.g. replace [HELP] with [Solved]).
If you want you may add Triggerhappy as additional label.

Cheers

I'm unix ingenior so, not really a probleme (I working on AIX, unix ibm)
But, no need to be unix ingénior to re-compiling, modify some files ;)
Just, like to understand how programme(s)/system(s) working and, have a lot of free time.

I make a video : https://www.youtube.com/channel/UC_LINfT958NsmNGUr2ILDkw