Add support for fading and cutting noteblock sounds

Also add a 1kHz sine wave sample, intended for use with this

nbsounds.lua

@@ -33,6 +33,7 @@ local valid_sounds = {
 	digistuff_piezo_long = "digistuff_piezo_long_single",
 	digistuff_piston_extend = "digistuff_piston_extend",
 	digistuff_piston_retract = "digistuff_piston_retract",
+	sine = "digistuff_sine",
 }
 
 local mod_sounds = {

noteblock.lua

@@ -73,7 +73,18 @@ minetest.register_node("digistuff:noteblock", {
 						if type(msg.pitch) == "number" then
 							pitch = math.max(0.05,math.min(10,msg.pitch))
 						end
-						if sound then minetest.sound_play({name = sound,gain = volume,},{pos = pos,pitch = pitch,},true) end
+						if sound then
+							if type(msg.cut) == "number" and msg.cut >= 0 then
+								msg.cut = math.min(msg.cut,10)
+								local handle = minetest.sound_play({name = sound,gain = volume,},{pos = pos,pitch = pitch,},false)
+								minetest.after(msg.cut,minetest.sound_stop,handle)
+							elseif type(msg.fadestep) == "number" and type(msg.fadegain) == "number" and msg.fadegain >= 0 and type(msg.fadestart) == "number" and msg.fadestart >= 0 then
+								local handle = minetest.sound_play({name = sound,gain = volume,},{pos = pos,pitch = pitch,},false)
+								minetest.after(msg.fadestart,minetest.sound_fade,handle,msg.fadestep,msg.fadegain)
+							else
+								minetest.sound_play({name = sound,gain = volume,},{pos = pos,pitch = pitch,},true)
+							end
+						end
 					end
 				end
 		},