Definitely part of the game. Try booting Castlevania Chronicles on PS1. If you have the Japanese version, boot it into original mode. If you have the US version, boot it into original mode while holding L1 and R1.
That menu will appear and let you choose the sound system; the PS1 version includes digital recordings of all three sound hardware types.
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Try checking the MAME manual at http://docs.mamedev.org
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