I've been trying to sound record this video of stewie beating up brian saying wheres my money. And everytime I record it with my sound recorder I open the file and it's volume is low. I check the recording devices and it says I have stereo mix with my speakers. No matter how high I put my speakers on the volume is still low.

I checked the volume mixer, and everything is on high including my speakers. I wanna make a version of family guy where's my money and it with another video but I can't do that if nobody can hear the audio. If you know the problem plz answer.