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"Just a note to say thank you so much, for doing such a great job ! My husband and I made this 8-Track tape in 1975, which was 35 years ago. We had given up on trying to get it restored, and then I found your website. Now, we can give copies to our children and grandchildren. It turned out much better quality than we could ever have hoped for. ..."

Beat

A successive rising and falling of a wave envelope due to alternate reinforcements and cancellations of two or more component frequencies.