diff --git a/sys/apis/sound.lua b/sys/apis/sound.lua
index 28ca11c..b4dab46 100644
--- a/sys/apis/sound.lua
+++ b/sys/apis/sound.lua
@@ -1,12 +1,18 @@
 local peripheral  = _G.peripheral
 
-local Sound = { }
+local Sound = {
+	_volume = 1,
+}
 
 function Sound.play(sound, vol)
 	local speaker = peripheral.find('speaker')
 	if speaker then
-		speaker.playSound('minecraft:' .. sound, vol or 1)
+		speaker.playSound('minecraft:' .. sound, vol or Sound._volume)
 	end
 end
 
+function Sound.setVolume(volume)
+	Sound._volume = math.max(0, math.min(volume, 1))
+end
+
 return Sound