softer whistle noise?

[TheRealFlapJackson]

im on the asd and part of my condition renders me sensitive to some sound, specifically ones that are both loud and highpitched ones. the whistle is incredibly shrill, and it's especially unpleasant when somebody is sitting around and spamming it.

would it be possible to have the whistle noise be altered to a different, less ear-piercing sound?

As another person on the ASD spectrum, loud and surprising noises are extremely scary to me. This would be nice, maybe also making John Bill's bus starting up less noisy.