If you have an active music event playing at all times and you want to lower it at a certain location? There are a few ways to go about this, it depends on what your end goal is.
WHat you may want to do is, assign the music event to a Bus Channel in FMOD the use the ButSetFaderLevel node in UE4 to drive the volume of the channel. You can use a volume trigger to send the overlap event
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