ちと調べてみたら国内版はボリューム小さくならんみたいね

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<rom type="adpcma" offset="0x040000">b62-15.3</rom>
<rom type="adpcma" offset="0x060000">b62-14.2</rom>
<rom type="adpcma" offset="0x080000">b62-13.1</rom>
<rom type="adpcmb" offset="0x000000">b62-18.31</rom>