Mupen 64 and parallel cores: Video and audio not sync

Hello everyone, i´m trying to sync the audio and video in some games like castlevania 64, Turok 3 and Donkey Kong 64. I´ve noticed that in Castlevania 64 there are missing voices in the intro, which reads: “Deep in his Castle, he stirs from a century of enforced sleep…Count Dracula awakes”. In the USA version this is totally missed, but curiosly is present in the european version, only the last part: “Count Dracula Awakes” is missed. The video and audio is more sync in european versions of the games, i´ve tried many tutorials and ways to sync audio and video in USA versions, without success, Could anyone recommend me some documents where i could find how to fix this? If it is posible to fix. Thanks.