diff --git a/main.gd b/main.gd
index 319d017..e8c0575 100644
--- a/main.gd
+++ b/main.gd
@@ -74,6 +74,8 @@ func list_levels():
 	return final_level_sequence
 
 func load_level(id):
+	AudioServer.set_bus_mute(AudioServer.get_bus_index("Master"), true)
+	
 	next_level_button.hide()
 	level_congrats.hide()
 	level_description.show()
@@ -132,6 +134,16 @@ func load_level(id):
 	game.write_file(win_script_target, win_script_content)
 	
 	terminal.clear()
+	
+	# Unmute the audio after a while, so that player can hear pop sounds for
+	# nodes they create.
+	var t = Timer.new()
+	t.wait_time = 3
+	add_child(t)
+	t.start()
+	yield(t, "timeout")
+	AudioServer.set_bus_mute(AudioServer.get_bus_index("Master"), false)
+	# FIXME: Need to clean these up when switching levels somehow.
 
 func reload_level():
 	load_level(current_level)
diff --git a/node.gd b/node.gd
index 19276b8..6537d88 100644
--- a/node.gd
+++ b/node.gd
@@ -12,9 +12,14 @@ var hovered = false
 
 var arrow = preload("res://arrow.tscn")
 
-
 func _ready():
-	pass
+#	var t = Timer.new()
+#	t.wait_time = rand_range(0.0, 0.1)
+#	add_child(t)
+#	t.start()
+#	yield(t, "timeout")
+	$Pop.pitch_scale = rand_range(0.8, 1.2)
+	$Pop.play()
 
 func _process(_delta):
 	if held:
diff --git a/node.tscn b/node.tscn
index ccb46f9..4773043 100644
--- a/node.tscn
+++ b/node.tscn
@@ -1,8 +1,9 @@
-[gd_scene load_steps=5 format=2]
+[gd_scene load_steps=6 format=2]
 
 [ext_resource path="res://node.gd" type="Script" id=1]
 [ext_resource path="res://fonts/default.tres" type="DynamicFont" id=2]
 [ext_resource path="res://nodes/blob.svg" type="Texture" id=3]
+[ext_resource path="res://nodes/pop.wav" type="AudioStream" id=4]
 
 [sub_resource type="StyleBoxFlat" id=1]
 content_margin_left = 5.0
@@ -61,5 +62,8 @@ __meta__ = {
 }
 
 [node name="Arrows" type="Node2D" parent="."]
+
+[node name="Pop" type="AudioStreamPlayer2D" parent="."]
+stream = ExtResource( 4 )
 [connection signal="mouse_entered" from="Rect" to="." method="_on_hover"]
 [connection signal="mouse_exited" from="Rect" to="." method="_on_unhover"]
diff --git a/nodes/pop.wav b/nodes/pop.wav
new file mode 100644
index 0000000..30985c7
Binary files /dev/null and b/nodes/pop.wav differ
diff --git a/nodes/pop.wav.import b/nodes/pop.wav.import
new file mode 100644
index 0000000..f7152c5
--- /dev/null
+++ b/nodes/pop.wav.import
@@ -0,0 +1,21 @@
+[remap]
+
+importer="wav"
+type="AudioStreamSample"
+path="res://.import/pop.wav-c45fbac324d41566fc00fa2a6560f011.sample"
+
+[deps]
+
+source_file="res://nodes/pop.wav"
+dest_files=[ "res://.import/pop.wav-c45fbac324d41566fc00fa2a6560f011.sample" ]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop=false
+compress/mode=0
diff --git a/repository.gd b/repository.gd
index b499b64..72042fe 100644
--- a/repository.gd
+++ b/repository.gd
@@ -143,7 +143,6 @@ func apply_forces():
 			o.position += dir*f
 			o2.position -= dir*f
 		var center_of_gravity = nodes.rect_size/2
-		print(center_of_gravity)
 		var d = o.position.distance_to(center_of_gravity)
 		var dir = (o.position - center_of_gravity).normalized()
 		var f = (d+0.00001)*Vector2(0.03, 0.01)