The second way would be to allow the client to play multiple instances of the same attack skill sound but make each instant gradually get quieter. for example we'll use Rage of Halon. The enemy and your main character's sound and party member sound take priority so they will be at maximum volume. So I cast Rage of Halon, then 3 other paladins in a fate not in my party cast Rage of Halon as well. My "Rage of halon" is the loudest and every other instance of the sound goes down in volume by a percentage by simulating distance from where you have your "Listening Position". So the client has to fire off 4 rage of halon sound effects, mine is 100% volume, the others are all based on distance. 2nd is 75% volume(Closest to my listening position), the 3rd is 50% volume(Second closest to my listening position), and the 4th is 25%(third closest to my listening position).