The tech didn't change that much either, PS1 is a rather simple evolution over the SNES with the number of voices bumped from 8 to 24 and RAM increased from 64kB to 512kB (same creator). What changed significantly starting with PS1 is that MIDI became the supported sequenced music format in development kits (before that point each developer had their own or licensed sound engines, with no standard libraries or formats to fall back on like Sony started to offer).
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