I've been listening in some detail to the different 7" copies of Duel that I own. According to the discography, ZTAS 8, PZTAS 8 and DUAL 1 all clock in at 4:07. My copies of PZTAS 8 and DUAL 1 clock in at 4:07, however, my copy of ZTAS 8 clocks in at 3:56, which is the timing the discography gives for the promo ZTAS 8 DJ. This is a slightly different mix of Duel, with more pronounced backing vocals and a short 'elephant noises' instrumental break. What I would like to know, is whether the correct timing for ZTAS 8 is 3:56 and the discography is wrong, or whether my copy of ZTAS 8 is a rarer version. Mine is in a standard picture sleeve with matrix numbers {ZTAS 8 A -2U-1-1-X 1} {ZTAS 8 B xx-1U-1-2-5} (the xx is two scratched out numbers/letters). Any thoughts? Simon