I want to change the pitch of my audio and I know that AV Foundation is not the place to look for that, but I don't want to learn Open AL because it is to low level, does anyone know what I would use as an alternative?
take a look at this link. Lately, I used csound API for creating MIDI sounds. But OpenAL is cross-platform audio manipulation library that is supported on the iPhone. Hope this answer helps you. Take a look at this FAQ.