Just a general question about mapping that despite a lot of reading, still don't really understand how it works. I am in the UK and have 4 Freeview tuners plus 2 sat cards picking up channels from Sky and Freesat. The question is, supposing I am recording with all four Freeview tuners and I want to do a futher recording of say BBC1. Now this is channel 1 on Freesat and my epg, but is channel 101 on both Sky and Freesat. What I do not understand is how the software would know to switch to 101 on a sat card, and indeed wheather to use Sky or Freesat. Maybe I am missing something here, but any enlightenment would be most gratefully accepted.