Yack is not credited in the arcade version, so I did not credit any songs to him. Though, now that I think of it, it's a convenience that it appears in the first song ID as well as the last one (00 and 35 respectively, keeping in mind IDs 00-07 seems to be used for work in progress songs, more specifically Hosoe's), implying that it was the last song to be added. Maybe Yack composed it at the last minute and Hosoe arranged it for the arcade version...
White Field comes from the original EX2, which has track credits in the liner notes.
Arcade credits