Ionic Native Audio Delay (fade in/fade out) not working

Hello there,

I’m trying to make the fade in / fade out effect using the Native Audio Plugin and its does nothing. The music simply play without any delay.

I tested it on Browser and Android 7.1 . I have the following code:

playmusic(){
		 this.nativeAudio.play('audio');
 }

loadmusic(path: string){
	if(this.loader){
		this.playmusic();
	}
	
	else{
			this.nativeAudio.preloadComplex('audio', path, 1, 1, 5000).then(() => {
			this.nativeAudio.play('audio');
			this.loader = true;
		});
	}
}

(The ‘5000’ was for testing purposes, it doesn’t work with smallest numbers either)

Everything works but the delay feature. Anyone?