Song list has nothing in common with Genos Playlist function.
Genos Owner Manual: Page 16: Song List: Plays back Songs continuously according to a previously created Song List.
I think the best solution is that you have to use Registration Memory to save Song in your regist memory 1 position, and to create Playlists with your registrations. In this way you can play each midi file by loading your song via registration.
Regards,
Vali