For anyone else who is having trouble with this,

I thought I would have another look at the FUNCube Dashboard. Latest version is 1.0.1044.1. Under "File>Settings" there is an "Audio" Tab. Selecting Cable Output VB-Audio Virtual works for me. You can get the Flex Radio output to appear in that box (DAX Audio RX1?).

73 and Merry Christmas, Terry Osborne ZL2BAC