An Automatic Soundtrack Generator permits merger of a sound track that is independent of the external sound source, while either recording or playing a video sequence. The Automatic Soundtrack Generator integrates in a video recorder or player a module that generates music or other sounds which either can be mixed with the originally recorded sound (sound mixing), or can replace the originally recorded sound (sound dubbing). This sound mixing or dubbing can be performed either at video/audio record time or at play back time.