Well, I'll be honest, I don't know how high you can hear...

[The typical hearing range for a human is between 20 and 20,000 Hz; which means they're getting into ultrasonic and animal frequencies, probably?? He tries to remember if there was a good documentary on this or if he ever discussed it with Epsilon...

Next is like... dogs? Cats? Bats?? He tries upping the pitch-frequency a bit more.]

^{How's this, then}?