Way to get/set the maximum distance of the 3D attenuation?

Question

I am using a custom engine and I'm trying to have the functionality where in the game editor itself you can define the radius/max distance of the sound. So visually you would be changing the radius of a sphere around a game object which would have an emitter. Is there a way to set this value and change the radius/distance using RTPCs or some other way possibly?

Thanks!