I'm trying to figure out how I can get Camtasia to NOT record sounds into my headphones mic on my Windows PC while I'm listening to my online webinar class. I have to be able to use the mic when it's my turn to interact in the class. But when I am just listening, I need to type notes without the sound of my typing being picked up in the mic. Is there any way to mute the headphones during the recording? Or is there some other way I can mute the sound while I am just listening to the class while recording?