Adjust sound channel volume.

Question

I'm wanting to allow the player to lower or outright disable volume levels for sound effects and music as desired. So, I created two additional audio buses (named sfx and music respectively). However, setting the node to the bus (For example, a death sound effect to the sfx bus) and then adjusting the volume yields no difference in playback. What am I doing wrong?

EDIT: I'm using Godot 3.2.3

Answer 1

You can change the volume of a particular bus with the AudioServer, see https://docs.godotengine.org/fr/stable/classes/class_audioserver.html

For example, to set the audio level of a bus called "SFX", I would do:

var sfx_index= AudioServer.get_bus_index("SFX")
AudioServer.set_bus_volume_db(sfx_index, value_in_db)

Make sure to check that the value you're using in is decibels, the higher the number, the lower the volume. https://docs.godotengine.org/en/stable/tutorials/audio/audio_buses.html#decibel-scale

Answer 2

Use the linear to don method, convert the sound quality depending on slider value. Check these video on how to use it:
Make a volume slider in 3 Minutes