This site contains a composer breakdown. The tracklist comes from the sound test.
Adapted to the OST ("Blow Away" was moved before "Warning Line"):
- Kohta Takahashi: 01, 03~06, 08, 09, 11, 15, 21*, 22, 24, 25, 27, 28**, 29**, 30
- Nobuhide Isayama: 02, 07, 10, 17, 26, 31
- Hiroshi Okubo: 12, 16, 18, 23
- Tetsukazu Nakanishi: 13, 14, 19, 20
- Guitar on 14: Kohta Takahashi
(* see below)
(** there are two "ending attracts" in the OST, dunno which one it is. However "ending attrack" was listed in Takahashi's liner notes as guitar only, so probably it's wasn't composed by him anyway)
The breakdown comes from Nakanishi apparently, the site's author said on
2ch he asked directly.
Quote:
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作曲者は私が本人（ってもなかにぃさんですが）から直接聞いたので間違いないです。
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The famitsu interview mentions 17 is by Ishiyama, and it matches the credits posted by Takahashi (except 21/28/29), seems real.
There is some discrepancy in track 21 though.
It wasn't in the liner notes by Takahashi so probably Nakanishi made the mistake.
Basically, according to the site's owner (also
here), the original composition should be by Masako Oogami [EDIT: earlier I wrote "Okubo" by mistake]
Quote:
21 Night And Day 高橋 弘太
これ間違ってますよ。
１にあった同名曲のアレンジ版で
作曲：大上昌子 編曲：諌山宣秀 > Composition: Masako Oogami / Arrangement: Nobuhide Isayama
あたりが多分正当な記述かと。
なんでそう言えるかというと私も諌山氏ご本人に訊いたことがあるのだ。
１の曲なのにコータ氏作曲というのはおかしいなーと思ってたから。
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The notes we have for the
Sound Invitation promo arrange say it is composed by Isayama...
It seems the track is an arrange from a previous game, which was also arranged for the promo. Some investigation is needed, but I unserstand the AC2 OST version is by Isayama.
For 28/29, since Takahashi doesn't list them in his site, assuming Nakanishi made a mistake in the breakdown and he himself didn't compose these either, they could be by Okubo or Isayama.