What is your audio interface?
I think the audio interface is Tascam made or Roland made to good.
IF your audio record track is 3/4 for stereo,You must choice the input select of track on console view.
And output is send for master.
For exemple, The input select is stereo US-366,and US-366's record mode is multi track.
For exemple2, The input select is stereo quad capture 1-2.
If you must create the midi track,You must add the midi track with Plug in track.
And your 3/4's midi track's output is choose the plugin of track on consol view.