Marshall MXL USB.008 USB Condenser Microphone What screen capture program do you use?
I use ffmpeg’s -x11grab option to record my desktop, though I have also used gtk-recordmydesktop for a quick and easy GUI front-end (unfortunately it only records in OGG format), and also kdenlive has a screen capture utility. While the option to record audio is available, I do my narration after recording my desktop.