Invalid call. Nonexistent function 'add_bus_effect' in base 'AudioStreamPlayer'

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By TheBadDev

So, I’m working on add a main menu music on my new game Alien Evaders (On itch) and I’m coding the thing where I get the music added but it’s going to make someone go deaf on how loud it is and I edited the pitch slider on the inspector tab, but it would be very loud. So, after a couple of edge searches and I added some lines of code most importantly.

music.add_bus_effect(0, pitchShift)

this is where everything goes wrong the music still plays but game won’t show up and I get the error.

Invalid call. Nonexistent function ‘add_bus_effect’ in base ‘AudioStreamPlayer’

Here is my code for the main menu

    extends CanvasLayer

var music: AudioStreamPlayer
var pitchShift: AudioEffectPitchShift

func _ready():
	music = AudioStreamPlayer.new()
	add_child(music)
	music.stream = preload("res://song.mp3")
	
	pitchShift = AudioEffectPitchShift.new()
	pitchShift.pitch_scale = -25  # Reduce the pitch scale
	music.add_bus_effect(pitchShift)
	
	music.play()

func _on_restart_button_pressed():
	music.stop()
	get_tree().change_scene_to_file("res://world.tscn")
	print("Start")
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:bust_in_silhouette: Reply From: crossbito

Hi! I think you are using the wrong class. AudioStreamPlayer doesn’t have the add_bus_effect method. Perhaps you are trying to use AudioServer instead, as it is the only class that has the add_bus_effect method from what I can see.