iOS ships with a fairly sizeable number of audio units. One of kAudioUnitSubType_ParametricEQ
, kAudioUnitSubType_NBandEQ
or kAudioUnitSubType_BandPassFilter
is probably what you want depending on whether you want to control Q
as well as Fc
and Gain
.
I suspect you will have to forego using higher-level components such as AVAudioPlayer
to make use of it.
The relevant iOS audio unit reference can be found here