Loop Bin Master
The endless loop of tape used for the high speed duplication of cassettes.
It contains both tracks of the cassette material, one going in the reverse of the other.
Usually ½ inch tape which is recorded at 3¾ ips and then run (typically) at 96 times speed to one or more slave machines loaded with a "pancake" of cassette tape the length of which usually allows some 30 copies to be produced of C60 duration. At the splice of the loop a sub audible tone is introduced which controls the cutting and splicing during the subsequent loading process into C0 cassette shells.