How to know the amplitude of an audio playing?

A bit new with OpenFL and Haxe in general coming from Flash. Basically, my question is how to retrieve the leftPeak and the rightPeak of a SoundChannel. ATM, they always return 1. Coming from Adobe Air, I was able to retrieve the correct values. Or is there any other way to this? Thanks in advance.

PS: Need this to run on HTML5.

Unfortunately, it appears that the leftPeak and rightPeak properties on the SoundChannel class are not implemented in OpenFL yet.