Jerry,
If you are asking how to play files AND sing with the vocal harmonizer that are not tune 1000, here's the problem.
Tune 1000 includes a vocal harmony track on channel 5. That is a track written musically to imitate voices sung. Although this track does not appear to play sounds as other tracks do, the volume is just much lower than other tracks.
Other song disks made by others, even though they have lyrics, might not have a track designated as a vocal harmony track. You are free to change the gm part on your X1 to be the vocalizer part, but just keep in mind it might sound real funny if you say pick part 03 which is usually the bass part and now when you sing you will here your voice and a bass line of you when you sing into the microphone. Likewise, other tracks will sound equally funny. Sometimes you just get lucky and pick a track which does a pretty good job. Also remember that not all tune 1000 songs have a vocal part arranged into it and sometimes, certain songs, to sound a play much like the original have only limited vocal harmony throughout the song.
George Kaye