first commit

Contents/mods/MyJoinMusicMod/42/media/lua/client/JoinMusic.lua

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+local function playJoinMusic()
+    -- We call the sound ID "MyCustomJoinSong" that we defined in our text script.
+    -- The sound engine handles the volume and file path automatically now.
+    getSoundManager():PlaySound("MyCustomJoinSong", false, 0.0) 
+end
+
+Events.OnGameStart.Add(playJoinMusic)

Contents/mods/MyJoinMusicMod/42/media/scripts/JoinMusic_Sounds.txt

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+module Base
+{
+    sound MyCustomJoinSong
+    {
+        category = UI,
+        is3D = false,
+        clip
+        {
+            file = media/sound/MyCustomJoinSong.ogg,
+            volume = 0.8,
+        }
+    }
+}

Contents/mods/MyJoinMusicMod/42/mod.info

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+name=Server Performance Tweaks & Hotfixes
+id=MyJoinMusicMod
+description=Optimizes server-side map streaming and cell cleanup.
+poster=poster.png