O:Please refer to below steps to set the audio device.

1.Install Realtek HD Audio driver from motherboard Support CD. Or download the Realtek HD audio driver from ASRock website.
https://www.asrock.com/support/Download.asp

2.Plug in your recording devices (Microphone or other devices) to the Line-in port (or Microphone port), and then the recording device will show up "Line In" (or "Microphone") icon. Please kindly refer to below image. (Control Panel > Sound > Recording)
*Before plug in the recording devices:

*After plug in the recording devices:


3.Reopen the Sound Recorder to record the audio.