Sound manipulation reverse/playing recorded sound backwards

[tomahawkPPC]

Hi fellow iPhone developers,

I try to get my head around how to deal with some challenging requirements for my iPhone App.

Requirements:
1. Record sound (voice of a person)
2. High quality 44100Mhz - 32 bit
3. Slow down playback (without pitching voice to high or to low!). however we would like to know how to do pitching/alter voice high and low as well.
4. Convert/process the voice backwards (reverse) and save/store it on the mobile device (OpenAL?)
5. Mark and cut/delete parts out off a recorded

Thanks allot guys!

Rick