I am curious about this too. If it just a standard midi file that we convert to a style file, than I guess we can use whatever sequencer program we like or the internal midi recorder.
I am currently using Cubase and there is an option to export to a standard midi file and I am sure most of the midi sequencers have this option. However, after that I guess we need some sort of program that can divide that midi file into the different sections including the start and ending parts and than convert the midi to a style file.
/Jugge