I've listened to their contents yes, but I don't have the originals onhand.
If you want samples just email me.
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Uncharted Waters (Arranged) album is KECH-1002. Some of the same tracks here are identical to those appearing on UW II SE and other albums, so I'll use those as comparisions since that's what you have handy.
Portugal, Olive Wind, and Symphony of Pirates are all standout tracks. Card Master is a SUPERB slow saxaphone piece with piano accompanyment, while Southern Twilight is an 8 minute Sade-styled smooth jazz number. There's also 3 vocal tracks.
Here's the track-by-track breakdown:
Looks like only 2 are exclusive, and they are pretty basic, nothing very elaborate.
01 Opening~Endless Voyage (identical to UW II SE)
02 A Siren Song (Exclusive to this album, childrens choir solo vocal, no instruments)
03 Echoes of the Middle Ages (identical to UW II SE)
04 Portugal (identical to Game Music Works: Yoko Kanno)
05 Olive Wind (identical to UW II SE)
06 The Palace (Exclusive to this album, solo organ church theme)
07 A Symphony of Pirates (identical to the Best of KOEI Vol.2)
08 Princess Chris (identical to Game Music Works: Yoko Kanno)
09 The Card Master (identical to the Best of KOEI Vol.2)
10 Southern Twilight ~ Dance on the Cape of Good Hope (identical to UW II SE)
11 Ending -Seven Seas- (identical to UW II SE)
Yeah this is harder to find than UW II, but it still pops up at Yahoo Japan Auctions every now and then, so it is certainly "findable" with some patience. Best of KOEI Vol.2 is pretty elusive though, although I have managed to purchase all 5 Best of KOEI albums in the past though, so it's certainly not impossible.
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Uncharted Waters (Original) album is KECH-1005. The full title is "Koei Original BGM Collection Volume 4: Uncharted Waters + Grade Up Version".
I'm assuming you're not looking for this album when you say [Originals], as these are the in-game sounds and not the superbly enjoyable live performances.
The two Upgrade tracks are medleys (11 minutes and 10 minutes) of nice quality synths, but obviously nowhere near as good as the live studio performances & acoustics of the full arrange album mentioned above.
The rest of the 21 track OST is basic synth that sounds somewhat about 16-bit SNES quality.
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