Yep they do count, they fire key events just like other keys. Perhaps you can filter them out in the textChangedObservable?
Hmm. 
Sry to interrupt but ‘Question here’:
Why not do it on ‘onBeforeKeyAddObservable’ ? And there you could also add a limit to the ‘case’ which would exclude all keys above (or not within) the limit?
I’m asking because I’m sure not a specialist of that but I use similar to limit the input in my scene and it works fine (although my case was not about the handling/exlusion of audio buttons - In fact, I didn’t even think of 'em 
You could make an array of acceptable keys, and then only push the results if keyFilterArray.includes(keyCode) or somethinig?
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