I did a search for your Numark Dj IO.
From there I opened the link to the Setup With Ableton guide.
Reading those instructions I saw:
"Note: the DJ|iO adds 2 sets of stereo outputs to your computer. However, it does not provide any inputs to the computer. The microphone input passes directly from the device’s in to Output 1, and does not travel to the computer."
This is not a recording interface. It is meant for DJ's to perform with.