Specific audio stutter in Alleyway map (ambient crowd noise)

In the alleyway map you can hear a crowd cheering(?) in the background throughout the map.

This sound stutters heavily for me, but only that specific sound.

Framerate is a steady 55 - 60fps, all other sounds are normal.

It sounds like either stuttering or rapid audio ducking, because it's not as bad if I stand still.

But once I start moving/killing things, the background crowd noise is like...

Aahhhh...a...a....ahhhAHhh...a.a.a........aaa......a...a...ahhhh

I figured out this is related to channel count settings in game audio options. I have mine on Low, so this happens, as hit effects (etc.) take priority over ambient noise.