iOS 6.1 regression?

Noticed that iOS 6.1 regressed from 6.0.1 in that in my case it has stopped
producing audio. Any regards on it? Test link is
http://cdn.grantgalitz.org/nope/iphone/iGBC.html#crazy%20zone%20%282%29%20%28bung%29%20%28pd%29%20[c].gbcand
it was even done to be "click to enable" like the apple docs say
(Supposedly apple modified it so it's crippled until a mobile touch event
fires with the web audio api calls in it). It was working in iOS 6.0.1
flawlessly, but isn't now in 6.1, so I'm wondering if there's some spec
change I overlooked.