Which Audio API to use for creating Audio Effects? <p>I want to record audio and apply custom-built sound effect filters, then play it back.</p> <p>Are Audio Units and Audio Queue Services the API I'm looking for? Or are there other APIs which fit this purpose better?</p> <p>Also, I've been told Audio Units can't be customized on iOS so there are just a few pre-made effects available. Is this true?</p>