This game is a successor of the Tobal series, Tobal No. 1 and Tobal 2. The audio stutters not only in arcade mode but also in quest mode. It affects the voice, hit sound effects and background music of the game. The slowdown happens in quest mode a lot, if you drop 50 items in different places (50 to the item shop another 50 to the grocery then another 50 to the restaurant and another 50 to the dungeon per level, etc). I don't know if the slowdown happens because of the game design or because of the emulator. I'm using the default settings, no custom plugins inputted. The serial number of the game I'm using is SLES-02111 while the bios is scph1001.bin.