When talking in games I hold my alt key, speak, then release it. Tried doing this with sound files that I play through my mic and noticed none were getting through. Went to keyboard tester sites and none registered me holding the alt key down. Keep in mind I always click apply after creating a command.
I tried using holding the alt key for x amount of time to give the sound time to play out. The alt key did not stay held down. Tried using press the alt key, playing the sound to completion, then release the alt key. I even tried toggle the alt key, playing the sound, then toggle the alt key again. None of these worked to keep the alt key pressed down.
I then tested using the z key in a document to see if the hold key down for 3 seconds option would type the letter z repeatedly but it did not. I tried press the z key down, pause for 3 seconds, then release the z key. I then tried toggle the z key, pause 3 seconds, then toggle the z key again. The z key did not repeat.
Forgive me if these images look too large in the post. I am simply using myimgur to capture the area of interest. Messed up a couple so left them out. I've also attached a short video explaining what I mean in case my writing is gibberish.