 The main reason for the use of this type of translation is that unlike synchronized voice translation, it takes a relatively short time to produce, as there is no need to synchronize the voices with the character's lip movements, which is compensated by the quieted original audio.When there is no speaking in the film for some time, the original sound is turned up.In later years, as more films are distributed with separate full mix and music+effects tracks, some voice-over translations in Bulgaria have been produced by only turning down the voice track, in this way not affecting the other sounds.