Dave, I changed Nav.1 to 1,0,1 and I can now change the frequency. (Will do the same for COM1 ) What I can't figure out now is how to switch from NAV1 to NAV2 and back.
You know the sort of thing you set up for arrival after a flight using radio navigation: NAV1 set to the final VOR waypoint, and then you switch to NAV2 which is set to the ILS frequency for your approach... well, can't do it because I can't switch radios.
Had a look through the Alphasim forums and no mention of the Halton/Halifax there, so maybe its time to register and see if anyone knows.
Thanks for the help in the meantime, Dave. At least you got me one radio working, mate.
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