I've tried to fade volume of a SKAudioNode to 0 with duration, but the duration doesn't seem to affect, the audio stops immediately:
let fireAudio = SoundManager.sharedInstance.fire //SKAudioNode
let stopAudio = SKAction.stop()
let fadeVolume = SKAction.changeVolumeTo(0.0, duration: 3.0)
let remove = SKAction.removeFromParent()
let sequence = SKAction.sequence([fadeVolume, stopAudio, remove])
fireAudio?.runAction(sequence)
Any suggestion? thanks