Going caving has become really annoying lately, and using my mob farm is almost impossible.
The bats spawn and make extremely high-frequency noises which are actually painful to my ears; I get a headache after just 5-10 minutes at normal volume. If I reduce the volume it's fine, but then I can't hear creeper noises either.
The bat "death" noise is fine, it's just the passive ambient noises that are a problem.
Please lower the frequency of the bat noises so they are not painful for those of us with extremely good high-range hearing.