The sounds themselves were fine, just the volume :D
It's a pretty quick fix in godot, for future jams you might wanna just add a quick h or v slider somewhere and connect the value changed signal like this:
func _on_h_slider_value_changed(value: float) -> void:
if value <= 0:
return
AudioServer.set_bus_volume_db(0, linear_to_db(value))