From our testing on our server, the audio seems to be "locked" inside the network bubble as of patch 1.22.
networkRangeDistantEffect = 4000; // network bubble distance for spawn of effects (currently only sound effects), set in meters, default value if not set. Is still working however not above 1.1k
We tested to set -1 which removed all sound which shows the command is still working but you can't increase it to over 1.1k
We usually have it set to 2500