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At first thought this was an issue with mono vs stereo sounds, but tracked down the issue to Source:SetRange(). Whenever the range of a mono sound is set to 1.0 or below, it will play at full volume no matter how far away the source is from the listener. Using a slightly modified version of the Source:SetRange lua example, the sound will play when the range is greater than 2 (which is the distance from source to listener) and when the range is equal or less than 1.0: function App:Start() self.window = Window:Create("Source SetRange Issue",0,0,400,300) self.context = Context:Create(self.window) local sound = Sound:Load("Sound/doors/fdn_door_automatic_servo_driven_close_short_05.wav") self.source = Source:Create() self.source:SetSound(sound) sound:Release() self.source:SetLoopMode(true) self.source:Play() self.source:SetPosition(Vec3(0,0,2)) local listener = Listener:Create() listener:SetPosition(0,0,0) range = 0.1 toggle = 0.005 return true end function App:Loop() if self.window:Closed() or self.window:KeyHit(Key.Escape) then return false end range = range + toggle if range>=3 then toggle = -0.005 end if range<=0 then toggle = 0.005 end self.source:SetRange(range) Time:Update() self.context:SetColor(0,0,0) self.context:Clear() self.context:SetColor(1,1,1) self.context:SetBlendMode(Blend.Alpha) self.context:DrawText(string.format("Range: %.2f",range),0,2) self.context:Sync(true) return true end