all sound goes forward, like when you put your hands on the sides of the mouth to sound more in the direction desired.

Using good judgment and sound decisions is the best decision to make when trying to attain desired results. Making the wrong decisions will not give you the best results.

That instrument is called a Metronome.

somehow, you can find out how long it takes for the sound to get to the desired area then find out the distance between them and distance divided by time is speed

One way to turn "sever" into a word with an "i" sound is by changing it to "siver." This change involves replacing the "e" with an "i" to create the desired pronunciation.