Thank you for the advice. I followed the precedure set out in the link and have managed to register from the M dial settings into C1 and C2 (this is the same procedure I thought I had been using all along except that I used the Multi controller to move along the items). However when I try to register another different setting on C3, it shows exactly what I had registered in C2 ! The top left box in the display shows "C2M" instead of "C3M. Well At least I've got two shooting modes working now.
