Hi pberry24,
Thank you for posting this concern of yours here in Microsoft Community. We're sorry for the delayed response.
The 3.5mm audio jack uses CTIA pin assignment (left, right, ground, mic).
If this answers your question, feel free to mark this post as an answer. Otherwise, don't hesitate to respond to this thread if there's anything else that needs to be addressed.
Kind Regards,
Crest