As I suspected way back when I wrote the very first version of my Jason Page music converter, but have only just now confirmed, the current version of that archive is not complete.
Have a look at
this list. There's Virocop tune 1, tune 2, and so on all the way up to tune 9. Then there are tunes 11 to 14. There is no tune 10.
What is particularly aggravating is that UnExoticA doesn't have the Virocop music at all, which closes off the solution I found when I discovered that some of Modland's Richard Joseph tunes were faulty. No other sites seem to collect these 'exotic' formats.
As for exactly what tune is missing, I confirmed my suspicions by watching the
longplay video. The numbered files are arranged in groups of two, and the two tracks within each group have the same samples. So tune 1 is the main theme for the first world, and tune 2 is the boss theme. Tune 3 is the main theme for the second world, and tune 4 is the second world's boss theme. Tune 9 is the main theme for the fifth world... and if you watch the video (2:18:00 is about right), you'll hear a set of tunes in the background of the fifth world's boss fight which do not exist in my archive.
Can somebody please re-rip the music from this game? I've come this far, I don't want to deprive my converter of every possible JPN file I can throw at it!