Add failure sound

init.lua

@@ -58,6 +58,7 @@ minetest.register_tool("teletool:teletool", {
 	wield_image = "teletool_teletool.png",
 	inventory_image = "teletool_teletool.png",
 	on_use = function(itemstack, user, pointed_thing)
+		local failure = false
 		if(pointed_thing.type == "node") then
 			local has_technic = minetest.get_modpath("technic") ~= nil
 			if(has_technic) then
@@ -68,12 +69,19 @@ minetest.register_tool("teletool:teletool", {
 					teletool.teleport(user, pointed_thing)
 					technic.set_RE_wear(itemstack, meta.charge, 50000)
 					itemstack:set_metadata(minetest.serialize(meta))
+				else
+					failure = true
 				end
 			else
 				teletool.teleport(user, pointed_thing)
 			end
-			return itemstack
+		else
+			failure = true
 		end
+		if failure then
+			minetest.sound_play( {name="teletool_fail", gain=0.5}, {pos=user:getpos(), max_hear_distance=4})
+		end
+		return itemstack
 	end,
 
 	-- Technic data