Hi @Led76
PixiSound also supports sound sprites, like Howler. You can see the example here: http://pixijs.io/pixi-sound/examples/sprites.html
With older Android Webview containers, you cannot multitrack audio. You can only have one audio file loaded at a time. If you're building an app, there are many options out there for embedding a Chrome Webview (with more modern features). For instance, if you're using Cordova to build your app, you can use CrossWalk to do this.