iPad Safari Audio Playback Question

Since the dawn of iPad time, I have known that Safari will play only one overlapping audio track on a Storyline slide. I'm sure I verified it at the time, and I spend significant time blending multiple tracks in Audacity to address this issue.

Then today out of nowhere, it came up in conversation that a more recent iOS version eliminated that issue.  If this is true, I don't need to be blending audio tracks any longer.  Instead, I can position multiple audio tracks on Storyline's timeline knowing that iPad/Safari/HTML5 will play back the multiple overlapping audio tracks on queue just like Flash output does.  This would be a real time saver.

Would someone from Articulate or anyone that might know post back here confirming this rumor and perhaps which version of iOS solved this limitation?

Thanks,

Sam