Legit Genesis FM synthesis pushed further than Sonic 1 ever went originally. Sonic 1 Megamix is one of the most ambitious Mega Drive ROM hacks out there and its 2008 soundtrack treats every zone like it deserves four full acts of distinct music.
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City Outskirts cycles through these variations that keep the same melodic DNA but shift mood across all four acts, which is something even official Sonic games rarely attempted. Dark Fortress goes full menacing with tighter, more aggressive FM patches that sound genuinely threatening.
Each character getting their own credits theme and invincibility jingle is such a nice touch. The whole OST feels like a love letter to the YM2612 chip. If you grew up on Genesis Sonic, this hack's music alone is worth tracking down.