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Mono Sounds Half as Loud as Stereo Sounds

Hi,

I am using Unreal Engine 4.26.1 and hearing mono sounds half as loud as stereo sounds. Here’s a capture of Windows mixer with the same sound in mono form, and stereo form:

e804db25-0a7e-4cae-b0e0-f64c7b525292.png

Is that behaviour expected? If so, what’s the recommended way to work around this - set the volume multiplier for mono sounds to 2.0, or prefer using stereo waves over mono waves?

Here’s the test project/data:

Thanks,
Alan