Cannot hear voices on copied disc

hello everyone ,

my name is domonic and i am new to the forum .
my problem is this :
i have a new lvw-5005 with the upgraded firmware . it copies the movies very good . i can hear the the music that plays in the movie , but i can’t hear the people’s voices or any spoken words .
this only happens when i record from "dvd "to the lvw-5005 . recording from the tv to lvw-5005 is no problem .
the tech at liteon wanted to restore my manufactors settings , but i did not because i did not know if this would erase my upgraded firmware .is there a way to raise the audio settings .
any help would be appreciated . :sad: :sad: :sad: