audio recorder & 2 sound sources
audio recorder lets you record both your USB microphone as well as the song you are playing. You can adjust the volume of the song being played and talk over it. There are two programs which are video-and-audio recording which let you do this also. With Simple Screen Recorder you must use Jack and it is very difficult to use. The other program is Vokoscreen, but currently it does not work due to some glitch.