is incorporated herein by reference for the sake of convenience the basics of such a system and method are illustrated herein and reviewed as follows fig1 depicts an exemplary set up for doing dubbing work numeral 1 denotes a recording sound motion picture film projector numeral 2 its projection objective numerals 3 and 4 the film reels and numeral 5 the sound motion picture film the projector 1 has a control panel 6 subdivided into a mixing panel 7 and a command panel 8 mixing panel 7 is used for manual control of the recording and playback amplifier of the projector e g to set the recording level for different audio sources feeding into the projector the command panel 8 is provided with a set of user activated operation switches commanding the performance of certain operations the vertical housing wall directly above the command panel 8 includes a recording level indicator 9 a window 10 in which is positioned a frame count indicator a reset 34 zero 34 button 11 for the frame film increment counter of the projector and a selector switch 12 for selecting different types of recording transition effects the frontmost vertical surface of the projector housing is provided with three input sockets 13 14 15 into which can be plugged the jacks of recording cables 16 and 17 and a microphone cable 18 these cables can be connected to a magnetic tape audio playback machine 19 tr a phonograph record playback machine 20 and a microphone 21 fig2 depicts the internal components of the projector 1 these include a projector motor 22 pm for film transport a projector lamp 23 a central switching and control unit 24 for changing the settings of mechanical projector components such as the film loop former the film guide plate at.