When the spirits attack, their attack sounds get cut off by each other.

Looking at the soundevent files, it looks like the spirits' damage and heal sound events have a limiter (6 for damage and 4 for the heal). The limiters are pointless here. It's not like e.g. Hand of God where the sound can stack to get insanely loud. Even when 30 spirits attack, the sound never gets that loud.

As of now, the limiter does nothing but create that choppiness and crackling/popping.

Here's a comparison between limiter on and limiter off