Thanks Etienne for the good explanation. I would like to clarify some more details. For this way of "playing" you should use MIDI files in which the accompaniment instruments play on channel 9-16. When Style is started with MIDI, channels 9-16 automatically stop playing and the Style channels take over the accompaniment. I'm pointing my finger at that at 0:44 seconds. Right after that I stop the Style, and you can see that MIDI channels 9-16 are reactivated.
With this approach, we can completely change the arrangement of the MIDI song. You can hear that at 03:14 where I continue to play the song Can Can along with the Oberkrainer polka. It can continue to play and after the MIDI ends, it is heard at 03:30.
So when the MIDI starts, we can easily sync the Style with it. However, Yamaha did not provide us with the reverse possibility. I want to play with the Style and at a certain point trigger the MIDI. The MIDI is out of sync. That's why I used a trick. I made a MARKER on the song and started MIDI manually. Look at the moment 01:56. Here we have to be precise so that the rhythm is correct. It's easy to make a mistake.
If you have any more questions, I will be happy to answer them.
regards, ckobu = casper