As said in your other topic, it’s heard quite clearly. It was also explained why you might experience it not being heard as you’re expecting in that same topic.
In my case, if I can hear that sound when I start the second engine after starting engine one, I use a sound equipment with two speakers which makes you hear that sound that you are trying to hear. With the device’s speaker it is somewhat difficult to hear it, but it is possible to do so.
At this point you sound like a petulant child. I also can hear the start up sounds just fine for both. Perhaps it’s time to take a step back from the keyboard.