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I am interested in writing a small utility to modify all audio output on OS X. I essentially want to apply a certain effect to the sound systemwide and/or via individual applications (similar to how Prosoft Hear operates).

Where would I start digging in order to accomplish this? Is this done through CoreAudio or are there other more direct option?

ylluminate
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  • Possible duplicate of [Mac OS X virtual audio driver](http://stackoverflow.com/questions/18443621/mac-os-x-virtual-audio-driver) – jscs Nov 25 '15 at 23:44

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Core Audio plugins can achieve all sorts of things, those are probably your best bet. I notice you used the kext tag - it's of course possible to do this in the kernel, but that seems overkill.

pmdj
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  • Well in one particular case I want to modify all output across the system to change the tonal frequency of the output. It *seems* that CoreAudio can do this, but I thought that perhaps writing a kernel extension might be necessary. – ylluminate May 13 '14 at 22:27