The NES sound chip doing things it probably shouldn't be able to do. These are the original Megami Tensei compositions given arrangement treatment, and "Death Match" rips with a ferocity that makes you forget this series started on 8-bit hardware.
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"DAEDALUS" (both the original and the D.B. version) layers this creeping tension through pulse channels that genuinely sound sinister. Then "Dimensional Trip" hits with a disorienting quality that sells the otherworldly feel completely.
Having both games on one release lets you hear how the composers evolved between entries, the second game's tracks running noticeably more complex. If you think the NES couldn't do dark and atmospheric, these 1987 originals will correct that assumption fast.