Apple has already rolled out the iOS 9, and many seemed to have installed it already on their iDevices. However, the OS causes sound problems with different apps and games, according to some users who have flocked on various online forums to gripe about the latest problems.

Reports have recently surfaced, saying some users complain of sound glitches when using a few apps and games.

Users of the Telltale Games' The Wolf Among Us, for instance, experience this issue. Users report that upon updating to iOS 9, some dialog lines' audio is found missing and the game does not play any music.

Telltale Games has confirmed that it is aware of the problem and claimed in a post that it is currently investigating the issue.

"If you are running iOS 9 on your iPhone or iPad, we are aware of an issue that causes music, voices, or certain sound effects to be missing," writes Telltale Games on its website. "Our team is currently investigating this issue, and we hope to have more information in the near future."

It said that at the moment, the only solution to the issue is to downgrade the iDevice to a previous iOS version, for instance, iOS 8.4.

Users who utilize their iPads for audio production are also complaining on some issues, particularly concerning the use of Bias Amp and Bias FX guitar processing apps of Positive Grid.

Some of the reported issues include popping noises, cracks or robotic-type sounds when using these apps after updating to iOS 9.

"After updating to iOS9, I had sound issues (pops, cracks, robotic type sound) in Bias FX... until I turned off stereo mode. Then it was fine. I turned stereo mode back on, and the sound screwed up again. My setup is an iPad Air 2, with a Focusrite iTrack Dock," writes a user on a thread. "At any rate, Apple got some 'splaining to do! Upgrade is suppose to increase performance, yet screws people's apps up."

"I am having trouble on all the Positive Grid apps (actually all my Guitar amp sims) on iOS 9. I get consistent Popping noises from Bias FX, Bias, and JamUP Pro. Also with ToneStack, AmpKIt and Amp One," another user also reported in the thread.

Meanwhile, a particular application which has been reported to lose its voice after the update is the Lumosity, a brain-training app. The developer admitted that it is aware of the problem, noting the issue is at Apple's end.

Additionally, a small percentage of iDevice users complained that their notification sound is not working.

Some of the suggested fixes to resolve this problem include muting notifications and restarting, hard-resetting the device, resetting Network Settings, and disabling and re-enabling Bluetooth.

Earlier this month, we reported on a security flaw on iOS 9.0.1 that lets attackers access the contact, photos and messages of a user with no PIN. The hack is performed through the help of Siri.

Despite the problems users encountered on iOS 9, we mentioned in the same report that almost one out of five iPhone users have installed the OS in less than 48 hours after it was launched, according to the mobile analytics firm Mixpanel.

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