Were you able to find a solution? Im trying to do the same thing where a concert is playing at the begining of the mission and I need JIP's to be able to hear it as well.
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NVM, I found a syntax that works
[mic, ["speech1", 10000, 1]] remoteExec ["say3d", 0, true]; <-------- will play "speech1" at a distance of 10000 from object mic for all clients on a server.