This is the "FM Synthesis style BGM pack" that can be switched in the game.
After purchasing the pack,
you can switch the BGM from below 2 styles.
"PSG Style" - the default one
"FM Synthesis Style" - included in this DLC
Software description provided by the publisher.
Game file size
WARNING: If you have epilepsy or have had seizures or other unusual reactions to flashing lights or patterns, consult a doctor before playing video games. All users should read the Health and Safety Information available in the system settings before using this software.
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