When I get home I'll post a picture of the pulse wheel, I think it may be starting from the wrong posistion.

I don't have linux here (apart from a clarckconnect server could try it on that) so I haven't been able to get the files into excel, I'll try that later, but it is very interesting to see your results. I am thinking it may be something to do with the wiring behind the selection buttons, the mech seems to have been adjusted sometime in the past and that could be effecting the switch contact ???

Cheers

Cris.