I have Graphene OS installed on my pixel 9 and regularly experience an audible alert which i am so far unable to identify. I can silence it by muting my phone fully but of course i need to still receive alerts on calls and messages.
I have gone through all my user profiles and checked notification history and app notifications, silencing all that appear at the time of the audible alert. Namely i found alerts from F-Droid seemingly coinciding with the sound(s). Yet, fully silencing any notifications and app notifications did not resolve the issue.
The sound is mostly often a combo. It primarily first makes a "shhh" sound and then quickly follows up with a "wee-woo" sound, sort of struggling to really describe the second one. It will occasionally just make the "wee-woo" sound.
I am hoping this sounds familiar to someone who can help me identify how to control this issue.