福間創『ambi-valance』EPシリーズの一つの到達点？シリーズ最新作は連番ではなく「extra」として発表。既存の１～４とは変則的に、あえて太陽誘電製CD-R（ブラック紙ジャケット）にオリジナルデザインのポストカードの特別仕様にしたその理由とは。ただ音の波に身を任せ、潜在意識の宇宙を旅する全4曲を収録

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