A copy of a tape. The original recording is a first generation tape. A copy is a second generation; a copy made from the second generation tape is a third generation, and so on.
"I received my album and the CDs that they were transferrred to yesterday. WOW! I can't get over how great they are. I have been playing the CDs and comparing them to my commercial Gilbert and Sullivan CDs. The CDs you produced are better than one analogue to digital CD, equal to the other, and comparable to the digitally recorded Cds. I get ..."