Sound attenuation(s) for megaphone situation

Hello, I was hoping I could get some advice on this topic.

Situation: A static megaphone type device that the player can potentially walk completely around.

Using the attenuation cone will work well while the player is within the cone but I would also like to give a lower sound volume of the .wav file when the player is not within the cone. The documentation states that ‘directly behind the cone results in silence’. This megaphone .wav file will be able to be heard well outside of the cone but at a much lower volume.

Can two attenuation types (cone and sphere) be linked into one? Will two attenuation types have to be created one cone and one sphere using the same .wav file and starting at the same time?

I’m just beginning with UE4 and would like to learn the right way to do this rather than come up with a kludge that will be fixed later on.

Thanks.