I don't know how to record something I've made on vita - like record and then transfer it to the arranger to mix/combine with other tracks later. If I knew how to use this tool I think it would help to add effects to the overall arrangement.
Thank you. Now we can understand what you are asking.
It is not absolutely necessary to "record" (export) your MIDI objects and/or tracks in MMM. However, doing so will help lessen the demand on your CPU, especially if you have a large number of MIDI objects, and it will allow you to apply volume adjustments and effects. Plus, you could have different instruments playing the same lines if you wish without needing to duplicate the MIDI object.
To "record" your MIDI object, make sure that particular track is the only one set to play "solo". Also, make sure the start and end markers at the top of the arranger are set at the beginning and end of the MIDI object. Then, simply go to....
File (menu) > Export > As wav...
Then, import the new WAV file into your arrangement.
I suggest exporting objects to be used in the arrangement in the uncompressed WAV format to maintain the highest quality and to allow the use of the Music Editor, if needed.
You can export the entire arrangement in MP3 format when you are completely finished, if desired. This will keep the file size down, and it can be used in any media player or MP3 player.