Brown,
What happens with the radios - do they completely not work or does only one frequency work? Check that the [radios] section of the A320's aircraft.cfg looks like this:
[Radios]
// Radio Type=available, standby frequency, has glide slope
Audio.1=1
Com.1=1, 1
Com.2=1, 1
Nav.1=1, 1, 1
Nav.2=1, 1, 0
Adf.1=1
Transponder.1=1
Marker.1=1
If it still doesn't work then you might need a different radio stack...
