I kept searching for “why isn’t unreal audio volume reverb working” and landed here. I found two things you have to do:
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When using an Audio Volume box, in its settings make sure the Audio Volume > Settings > Volume is at least 0.5 (perferably 1.0). Also set the Audio Volume > Settings > Fade Time to something shorter than 2.0 seconds (like 0.2 seconds) otherwise you might run in/out of a room to quickly to hear the reverb effect.
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Turn up the 2D sound send on the Master class. The easiest way to get there is: Project Settings > All Settings > search for “default sound” > Default Sound Class > select Master and then click on its icon. Once the editor loads, in the Details panel search for “reverb” and make sure a) Send to Master Reverb Submix is checked and b) Default 2DReverb Send Amount is 1.0.
Update 2/16/2024:
But wait. There’s more.
I did some refactoring to assign a “Sound Class” to each cue. I chose the built-in “SFX” sound class:
That broke things. Instead, I created a new Sound Class: Content Browser > Add > Audio > Classes > Sound Class. I called it “A_SFX”.
And under its Submix I changed the “Default 2DReverb Send Amount” from 0.0 to 1.0.
