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If the projector has no facility for reverse running, you will find it quicker to make rapidly cut sections up into loops. You can then project the same few shots repeatedly, adding sound to a fresh shot at each passage. Splice a length of unstriped film (preferably black) between the beginning and end of the loop. One loop should be as long as you can handle without risk of damage. Generally 20-30 feet is the limit.
The black unstriped film should be at least 26 frames long. This will ensure that you are not misled by recording sound for the first shot on the stripe alongside the last shot.
Adding sound to a loop of this sort is quite simple after a little practice. First of all, it is a good plan to erase completely any existing recording on the stripe. This is essential if your projector has an erase head greatly preceding the record/playback head. Now wait for the black leader. As soon as it has passed through the gate, record sound for the first shot. Immediately at the end of the shot, switch to "playback". You can check this first recording on its next passage through the projector. If it seems satisfactory, switch to "record" at the end of the first shot and record sound for the second shot.
Working in this way, it is a fairly simple matter to add sound to the most difficult sequence. You will not, of course, be able to record sound to the first 26 frames of each loop because the corresponding track would be on the unstriped leader. However, it does not take long to record the appropriate sound once the loops have been spliced together again in the correct order.
Whichever method you use, loop or shuttling to and fro, you may encounter a minor timing difficulty. During recording, you may tend to be slow off the mark switching in the sound for each shot. If the delay is noticeable on playback, you can usually eliminate it from future recordings by threading the projector with a bottom loop greater than normal. This means that during the recording sessions, the projected picture will, as it were, anticipate the picture the
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