ABSTRACT
How do you make a sound negative and prepare it for printing? You must first send the master magnetic track off to a sound recording studio to be “transferred” to optical sound. Before you send it off, you must mark an audibly recognisable point by replacing one frame of the leader with a frame of thousand cycle tone. You might perhaps remove the figure 3 on the leader and replace it with a frame of tone. This frame will reproduce as a bleep — and will give you a point to refer to on the sound negative. The bleep will immediately be recognisable as one frame of closely spaced lines.
