Not true. I have plenty of apps that are supposed to play default sounds and they're all muffed up too on all three of my IOS devices.
I can't understand why Apple is letting this go on for so long. I can understand that maybe they're going through and trying to clean up old code sometimes things like this happen, but something this severe needs to have the new code stripped out and the old put back in ASAP, much like they took too long to go back to the old WiFi code. This is basic functionality, part of the whole "it just works" thingy. It is making me insane and has caused me a TON of trouble. Right now at home I have my android tablet booted up and running so I at least don't miss things when I'm home. Pathetic.
I plan to never update to an iOS x.0 release ever again at this point. I should have waited for 9.1
Sigh.
If you buy the latest iPhone you're stuck with the x.0 version of iOS whether you like it or not. It's strange that those who keep their phones two years actually get to have a year with a totally functional o/s whereas those who upgrade annually are forever running beta software.