if your sound card is built into the motherboard of your computer your sound from recordings are going to be lower in quality and sound install a new sound card and shut the other sound card on the main board off this is the only way to fix your audio problem also check to make sure your sound volume is at the max when recording tv it seems to make improvments
BUT THAT THE FUNNY THING ABOUT IS THAT IWAS WORKING FLAWLESSLY IS ONBOARD BUT I DONT KNOW WHAT HAPPEN ?