What happens if a sound cue and a sound wave (that is connected to aforementioned cue) are both set to a class?

I’m curious how the routing works with multiplyers in mind.

If a sound wave is referenced by a sound cue, and both assets are routed to the same sound class, how does that impact routing and the sound? Will it have no audible difference, or will it double the volume or any other adverse sideeffect?

Additionally, what if a wave is referenced in a cue and the wave is going to one class, and the cue to another? Does this double the sound, or will it be overridden by the cue?