custom AudioUnits and processing iTunes library on iPhone

Quick set of questions regarding feasibility of music processing on
the iPhone/iPod:

1. Can an app install AudioUnits? (Are custom AudioUnits supported?)
2. Are "Media Player" apps allowed? If not, is there a plug-in
architecture for the iPhone's iTunes or whatever its called?
3. Is there any way to process the user's playing music in real time?
AudioUnits or OpenAL?

Thank you in advance!

-Kevin
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