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Old 22 April 2015, 12:02   #20
dlfrsilver
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Well, some games are using custom drivers, with custom modules. In this case, there is no problem. You have music and SFX.

The problem arise with games that are NOT using such schemes. And those are numerous.

this means changing the way the music operates with SFX, reprogram fully the sound driver, and modify the game engine, which can lead to timing or behavioral problems because of the way it was coded from the start.

It's not as easy as it sounds, it's not like reprograming a coin-op sound processor ROM which operates seperately from the main processor.
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