Never heard of this album before, but just going by the tracklist, it looks like there are a few game tracks in there, and it also looks like a lot of the original pieces appeared on previous albums. Let's see here:
01 stacomPS2.DnB (Sanodg Mix)
Same name (basically) as track 3 on the
PS2 GitS: SAC OST. The one on this album is a minute longer though, so arrangement?
02~05
These all have the same names as tracks from Drag-on Dragoon. The track times are all pretty much identical, so they might be directly from the game. Track 5 is translated as "Exhausted" (specifically, "Route B Staff Roll 'Exhausted'") on the
second OST volume, and the lyricist there should be
Sawako Natori, not Eriko Hatsune.
Joshin agrees.
08 Namoon
This is an O.M.Y. piece, it appears on their
second album. It also appears on a couple of Aihara's original albums,
TTRC-0020 and
TTRC-0030, so I don't know what's up with that.
09 I Will Not Forget
Track 11 on
TTRC-0014.
10 Twist Of Fate
Track 3 on
TTRC-0025.
11 Amplitude
Track 4 on
TTRC-0024.
12 Leaning Tower
Track 5 on
TTRC-0026.
13 Shanghai Discotheque 2001
Track 9 on
DMCD-0005.
6, 7, and 14~16 I couldn't find anywhere, so they could be original for this album.