I have successfully exported songs to a project before, including the song i'm trying to export now.  I have 3 midi tracks.  they are all unmuted when i export to a project. Project page opens and exporting appears to be successful.  After it's done exporting, i notice that one of the tracks did not export with the others.  When i go back into the song, that track is muted.  I unmute and try again - same result.  Can't figure it out, but i am no expert at studio one.  Very novice and have only been using for a couple of months.  Any help would be appreciated.