[wd40addict]

Don't forget there were also different versions of CCIR/IEC as time went on: originally 7.5ips = 100us & 3.75ips = 200us, later this became 70us & 140us. Got a feeling it changed again later.

Then if you like pumping noises there was DBX.

Finally, in the early days there was British or Continental tracking (whether top or bottom track was recorded 1st)

Ooo I nearly forgot oxide in, or oxide out!