In the current state, this mechanic and its fine-tune is really really good, however not as much for people with hearing issues and poorer quality headphones.
Hence I think that as part of gameplay, there should be items that would help with making the mechanic more accessible for those people.
An addition of Stethoscope, that can be only found uncommonly at the abandoned Ten A hospital and rarely at Dr. Pena's cabinets as well as rarely to sell at passmore's. By itself it should amplify the pitch of regular clicks and correct clicks, as well keeping the randomness diviation the same, or even shorten it (but still to some degree both types of clicks should overlap).
Orange Powder could alternative (ideally it would be nice to have multiple options) also enhance your hearing, producing similar results as above, but at a cost of having a music heard in the background.
In the current state, this mechanic and its fine-tune is really really good, however not as much for people with hearing issues and poorer quality headphones.
Hence I think that as part of gameplay, there should be items that would help with making the mechanic more accessible for those people.