USB Mic won't work with Virtual DJ Pro...?

Alright, so I have a Samson C01U USB microphone and I use it all the time. It is set as my default mic and what not but when I go into Virtual DJ and record, the spot where I talk is blank and the part where I put the music is there. I do not get it. My input is set to Mic and my output is set to headphone and speaker. Help please! Thanks! :)