Referring to ROG's idea of using AUTO CONVERT INDIVIDUAL MIDI TRACK TO AUDIO TRACK, you may find it more convenient to Convert using the "Audio File" option. This option renders to a file outside of the Seq song file (I use an overall folder in the song name which contains all the various data files used). This can then be opened in your Seq file using Audio > Import Wave File. As this is being imported you are offered a number of options to load stereo, mono or stereo opened to left and right tracks separately. This is quite a fast process and you retain the original track elsewhere for further use if necessary.