Make selected clips appear above other, add transparency to the clip background.

Controls/AudioClip.tscn

@@ -12,6 +12,7 @@ border_blend = true
 
 [node name="AudioClip" type="Panel"]
 modulate = Color(0.552956, 0.552956, 0.552956, 1)
+self_modulate = Color(1, 1, 1, 0.588235)
 clip_contents = true
 custom_minimum_size = Vector2(4, 64)
 anchors_preset = -1

Scripts/AudioClip.gd

@@ -95,11 +95,13 @@ func _input(event):
 func make_selected():
 	on_selected.emit()
 	var color = get_theme_color("selected_modulate", "AudioClip")
+	z_index = 1
 	modulate = color 
 	pass
 
 func make_deselected():
 	on_deselected.emit()
 	var color = get_theme_color("deselected_modulate", "AudioClip")
+	z_index = 0
 	modulate = color 
 	pass