Hidden Memes
Complete overhaul of sounds plus a few subtle MEMESINCLUDES DMCA MUSIC DOWNLOAD AT YOUR OWN RISK
It is not mandatory that other players have the mod installed.
New experimental feature of CustomSounds, which allows your friends to synchronize their custom sounds with yours. As before, you can type in "customsounds help" to see all the available commands. The command of interest to you is the "customsounds sync" command.
Once you type in this command, everyone in your lobby should get this prompt:
CustomSounds Sync | Press F8 to accept the audio sync request.