This is how I would translate what I believe is a mini tutorial posted by a Japanese Cakewalk user:
How to add an audio or midi track in Sonar 2015
First, select either to add audio or add midi track from the pull down menu.
Next position your cursor on the button in the track header to select input and output options for the track.
If you have created an audio track your input must be the audio device you are using (like Presonus or Focusrite).
The output for the audio track should be assigned to the master out.
If you have created a midi track your input must be the midi instrument (keyboard, guitar or drum pad) you are using. Also for the midi track, the output must correspond to a VST instrument plugin that you choose to provide the sounds you want to produce. A patch may also be required to further specify which sound or sounds from the plugin banks is to be played.
By doing this, you connect the track input and output to the appropriate places so the midi notes you play will play the desired notes on your chosen VSTI. Similarly, your audio line in directly from your guitar (for example), mixer or amp will be properly hooked up for an audio track.
That is how I go about setting up my tracks. Thank you for reading my post.
I wonder if the Japanese have the same trouble reading translated English manuals as we do with Japanese products.