I always thought the 'Overture' from the Yellow Shark video was unreleased, but it turns out that most of the music is almost exactly the same as the second half of Dio Fa. There's a flute line at 3:45 and a plunky-percussion melody at 5:45 that are definitely present in Overture. Lots of other cues match up too.
Regarding the overture I think that The EM performed along side the Synclavier & "embellished" the piece a little, maybe this is why FZ decided not to release the EM version & waited to unleash it as Dio Fa on phase 3.
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