can't record second track in multitrack box

I use audition 2. Via the Edit box I can record a track. I put this track on the 1st track in the multitrack box.
There I want to record a second track while listening to the first track.
I push the armed for record button on track 2 and push the record button in the transport box.
Now it starts recording but no sound after recording.
What am I doing wrong here?

thanks,