Just find a file which comes with its own editor, and then fill in the appropriate keys for each channel, or download a copy of picbined which should allow you to do the same thing with any file- make sure it is set for Viaccess and on "auto detect" so that it can read which ever type of file you load. You shouldn't have trouble finding a suitable file as most work on the Fox, and picbined is widely available on the web.
