Headphone accommodation with audiogram

Hi,

i am developing an app to enter audiogram data to Apple HealthKit and i want to have a little more information about Apple‘s headphone accommodation. is there any information about how the accommodation exactly works? Which filters will be applied in the background? How are the filter coefficients created etc.? Is there any access to the resulting eq curve? Is there also dynamic compression used in a certain way?

Kind regards, Tom

Headphone accommodation with audiogram
 
 
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