Why doesn't mic melt when I run YouTube?

Why doesn’t mic melt when I run YouTube?
I use the capture board to broadcast, but when I play a song on YouTube on a game computer and record it, the microphone sound may not be recorded. Why is that?

Hi! Make sure first that your mic isn’t muted in the XSplit Broadcaster window. You can check the mute/unmute icon right above the list of sources: image

If it’s not muted, make sure that you have the correct mic set in your Tools > Settings > Audtio tab.