On Mar 2, 2005, at 10:43 AM, G.I.O. wrote: > Is it center track or edge track? > For mono, it has been (in the US) 200 mil edge track since the 60's. Center track mono is very uncommon, and typically ancient. For stereo, there are a couple of different standards -- 200 mil edge track, 100 mil center, or the EBU 150 mil edge, 150 mil centre (I think).