First commit

depends.txt

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+default

init.lua

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+minetest.register_craftitem("trumpet:trumpet", {
+	description = "Trumpet",
+	inventory_image = "trumpet_trumpet.png",
+	on_use = function(itemstack, user)
+		minetest.sound_play("trumpet_trumpet", {
+			pos = user:getpos(),
+			max_hear_distance = 75,
+			gain = 4,
+		})
+	end,
+	groups = {instrument=1}
+})
+
+minetest.register_craft({
+	output = "trumpet:trumpet",
+	recipe = {
+		{"", "", "default:gold_ingot"},
+		{"default:gold_ingot", "default:gold_ingot", "default:gold_ingot"},
+		{"", "default:gold_ingot", "default:gold_ingot"}
+	}
+})

init.lua~

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+minetest.register_craftitem("trumpet:trumpet", {
+	description = "Trumpet",
+	inventory_image = "trumpet_trumpet.png",
+	on_use = function(itemstack, user)
+		minetest.sound_play("trumpet_trumpet", {
+			pos = user:getpos(),
+			max_hear_distance = 75,
+			gain = 4,
+		})
+	end,
+	groups = {instrument=1}
+})