We have a project running using FMOD 2.03.06 on a VisionOS headset. We hear a loud, short, crackle / sound munge sound when the App is interacting with the OS. We have the same projects on iOS and DO NOT hear the same problem on there.
On VisionOS, if you open a native alert while playing sound with FMOD, you hear this crackly distortion. You can also hear this:
- when closing the popup,
- when opening other native UI such as game center achievements,
- when force quitting the app via Vision’s force quit menu
The audio is expected to continue playing while the popup is there, which does happen, but the crackle should not happen.
This reproduces in our main game, but also in a simple fresh project with FMOD added. Simply start a long fmod sound playing (e.g via emitter) and then trigger a native popup (or do one of the other things, like force quit).
(we have noticed that this effect is only on the FIRST popup, subsequent popups do not cause it to happen)
A suggestion to resolve other crackling effects - increasing the dsp buffer size - eliminated console warnings about a starved buffer but did NOT resolve this issue.