MARC21       007s'12  Special playback characteristics
     Values: 
              a   NAB standard
              b   CCIR standard
              c   Dolby-B encoded
              d   dbx encoded
              e   Digital recording
              f   Dolby-A encoded
              g   Dolby-C encoded
              h   CX encoded
              n   Not applicable
              u   Unknown
              z   Other