I can no longer SWAP radio frequencies in FSX using the X keyboard key. Consequently you cannot program a button for that procedure. It worker fine in FS9. I havn't used this since installing the new FSX so I don't know if this is a bug or happened after installing updates and Acceleration. CAN ANYONE ELSE SWAP FREQUENCIES using (X) keyboard key in FSX with these installed.???It is listed ok under Buttons & Keys in FSX Control Panel.Thanks in advanceChuck

Chuck,Works here. Are you saying the button assignment is gone from the control selections or is the entire selection missing so you can't assign any button to it?

Everything is there but hitting X on Keyboard or assigned button doesn't swap frequencies on radio stack.Chuck

Open the aircraft.cfg and make sure the radios have standby. In the example below, all four radios have standby and only NAV2 had glide slope.// Radio Type=availiable, standby frequency, has glide slopeCom.1=1, 1 Com.2=1, 1 Nav.1=1, 1, 1 Nav.2=1, 1, 0 Without standby, the swap freq will not work.If this is not it, then I have no ideas for you.Phill