When I copy from some of my VHS tapes to DVD I've noticed that some tapes don't copy well. These copy too brightly to my DVD, creating hotspots which lose a lot of detail from the original recording. Whenever the scene turns bright, it is also accompanied by a slight buzzing sound in background. I orginally thought it was being caused by my Philips DVDR75, so I purchased a Magnavox, but had the same results. Since this problem is only on some tapes and since it is the same for the Magnavox, I suspect the tapes. Do you think a copier enhancer would solve my problems? Can you filter out video brightness problems with these? If so, can you recommend a brand name that will do the job?