I don’t recognise that app either. To start with, I suggest uninstalling apps that were installed since just before the issue started, starting with any you do not recognise such as that Blumer app.
As you mention that Malwarebytes didn’t find an issue, I suspect it could be an ad-supported app that may have been installed. This is a very common issue with Android devices with many “free” apps, where the ad component descretely runs in the background displaying pop-up ads. The Windows Store likely carries similar apps.
- Open the start menu and click the cog wheel on the left.
- Go into Apps, then click Apps and Features on the left menu.
- Change the “Sort by:” drop-down to “Installation date”.
- Uninstall any App that you do not recognise since just before the issue started.
If you still get those sounds, try uninstalling every App that was installed since the issue started. You can always reinstall again them later.