CPS-2 QSound processing turning classic Mega Man themes into something that thumps through arcade cabinet speakers. Rockman: The Power Battle has Hideki Okugawa and Setsuo Yamamoto rearranging Robot Master themes from Mega Man 1 through 7, and the upgraded audio hardware makes everything hit different.
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Napalmman's theme gets this deep, booming low end that the NES couldn't dream of, while Geminiman's rearrangement adds new harmonic layers that make the original feel like a sketch. Cloudman from MM7 transitions surprisingly well to the arcade format.
Even the stage select screens have presence. The whole thing plays like a greatest hits concert but with better speakers. Essential for anyone who wants to hear where these classic themes peaked in raw arcade power.