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removing also that part of the music which accompanied it. If you try to replace only this section of the music, you will be left with a discontinuity at beginning and end of the new recording. You must choose between replacing the whole piece of music and recording the music passage on a separate tape which can be cut and spliced to produce a perfect match.
Re-recording all the music is particularly undesirable if it is a long piece on which you have already made several successful superimpositions. Cutting-in a new piece of tape is a very exacting job and even less attractive as a solution.
Twin-Track Mixing
With a twin-track recorder (p. 65), there is another way of superimposition which overcomes these difficulties. Although it is more convenient to use, this method involves some modification of the recorder.
First of all, you need an additional record/playback head. These are readily obtainable as separate components. Mount it on the recorder, upside down if need be, so that it operates on the half of the tape you are not normally using.
Starting with a completely erased tape, use the new record/playback head to record all the commentary in correct timing with your film. Because the recording is on the "wrong" half, it will play-back in reverse if you use the normal record/playback head for reproduction. Don't worry about that — you are not going to, just yet.
Now you rearrange the connections so that the new record/playback head feeds the microphone input of the amplifier while you supply music (e.g., from discs) to the pick-up input. Then if you run through the tape again, commentary from the tape can be mixed in the amplifier. The output can be monitored on a loudspeaker with no risk of the microphone howl which would occur with a five commentary. So by simple adjustment of volume controls, you can adjust the balance of speech and music all the time.
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