A type of symmetrical variable area sound track recognizable by the fact that in the print the central axis and surrounding modulated area are transparent, whereas as in the duplex type they are opaque.
"The original record I had sent was a very old, scratchy, out of print record that our family listened to years ago every Christmas Eve. It was especially played for my Italian grandmother who died in 1983. I cannot describe the emotion in the room when I played the new CD for my parents, now close to 80 years old. The memories were so good, and ..."