Unwanted Volume Ducking - Regardless of Soundmix or Concurrency Group

I’m having a lot of unwanted sound ducking in 4.18.0.

I have loud gun sounds and they’re lowering my looping music volume so much that it’s almost inaudible for a couple of seconds after firing.

My music doesn’t have a concurrency group, it has the highest concurrency priority, it’s set to the “Music” sound group and also it has a custom simple music sound class with no reverb or anything.

I tried changing the priority of other sounds, removing my custom music class and anything else I could think of, but nothing seems to have an effect at all. Does anyone have a solution?

Nerdsbeware seems to say that the ability to disable ducking was only added in 4.20? Is that true? Is there no way at all to disable it in 4.18???

I’m definitely not ready to move to 4.20 because the last time I updated my engine version, I had crippling Unreal bugs that took the Unreal team almost a year to fix.