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If you imagine a sound waveform going up and down, and you edit it so that the outgoing cut is at the top of the cycle and incoming cut is at the bottom of the cycle, then at the join there will be a very sudden transition in the waveform from top to bottom, probably leading to an audible pop or click.
When you edit audio in an audio editor, you can avoid this by cutting at zero crossings - the place where the waveform is neither high nor low, but in the middle. However, it's not so easy with video, where the video frames may dictate exactly where the cut happens. Using a very fast audio crossfade at the video edit can help by smoothing over any potential click or pop.
That's the background - I'll leave it to others to answer the rest of your actual question!
Many times this can be fixed by updating Quicktime, your audio card's firmware and, especially, your RealTek drivers.
Thanks for your input. Actually, there was no audio where I cut, nor where I joined the video clips. I didn't explain the waveforms very well. The audio track 1 above the yellow line had the big waveform blip--which was the loud pop, but other than that blip, there was a flat line before the blip and after the blip. The same audio track 1, below the yellow line was also a flat line on both sides of the cut, but there was no waveform blip corresponding to the blip in the upper half of the track. I don't know why PE4's audio track is divided by the yellow line with identical waveforms above the line and below the line. (Maybe for stereo and this video is mono?) I was puzzled that the waveform blip (the audible pop) appeared only in the top half of the audio track 1 and not in the bottom half.
Thank you for your suggestions. I spent half the day updating Quicktime, my Sound Blaster Audigy card's drivers, and while I was at it my NVIDIA graphics card with the latest drivers. I don't have RealTek. When I searched for firmware, I couldn't find any, but I found this post in Creative Labs forum:
<<But why do you believe the firmware is "user" upgradable? I remember the modification of a SB Live! to SBLive! 5.1 included the step of unsoldering the chip, reprogramming it and then resoldering it. I doubt any of the Sound Blasters has a Flash memory device onboard, which can be reprogrammed without removing it from the board.>>
I learned at Movie Maker technical support forum that I'm not the only one who gets audio blips when movie is saved as avi. So maybe it's the software. I'll use another program.
Better if you edit it in premiere elements and then save your edited portions as DVAVI and then discard orginal video to save disk space.