Any 2 to 1 (or 1 to 2) adapter placed in a line to split a feed.
"I have been looking for someone to transfer two very old and precious recordings for years. We had no way to listen to them given the outdated technology. One was a USO recording my dad made in WWII. He was 18 and sending a letter home to family. My dad died when I was 9,so hearing his voice again was something I longed for. My sister was ..."