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MSFS Just a rant about Wwise but maybe it will give some tips.

I've slowly struggled through learning Wwise to create my own soundbank and have mostly been able to get it to work but today I realised me external engine sounds weren't working. I have spent so much time checking settings and copying and pasting sounds. Eventually, I noticed my soundbank had gotten smaller and that was the start of the clue.

Check to make sure your sounds are included in the bank. There's a couple of ways to do this. First, you can go to GeneratedSoundBanks/Windows and open the xml for your soundbank and check that the file name is included. My combustion sounds had disappeared from this file so my sounds weren't being included in the soundbank but the question is why?

Go back into Wwise and press F7 to show the Soundbank Layouts (or select it from the menu). Select your soundbank and then in the Soundbank Editor below click on the Edit tab. This will show if you are sounds are included or not. This is the second way to make sure your sounds are included in your bank.

My combustions sounds did not have a tick next to them. They were in the list but not being included. After some more hair pulling and messing about I found the problem. In my combustion switch container, looking at the Contents Editor I noticed that the INSIDE and OUTSIDE assigned Objects were unassigned. Simply dragging the combustion_inside onto the INSIDE and combustion_outside onto the OUTSIDE objects in the Assigned Objects part of the Contents Editor included the sounds in the soundbank.

I think, originally, I must have not had the combustion_outside assigned so it wasn't included in the build. In my efforts to solve the problem I must have unassigned the combustion_inside which led to the smaller file size. After assigning combustion_inside and combustion_outside the file size increased from it's original size. Checking the XML showed that all files were included and loading in MSFS the external sounds now work.

The lesson here is make sure all sounds in your Contents Editors are assigned to the appropriate objects. And switch to the Soundbank layout (F7) and check the Edit tab in the SoundBank Editor to make sure all your sounds are included in the soundbank. MSFS can't play your sounds if they're not in the soundbank so double check this first before you continue debugging.