Use OpenAL for audio playback, audio processing for the beginner iPhone has a very good help.

ObjectAL-for-iPhone-master
..........................\.gitignore
..........................\ObjectAL-for-iPhone.podspec
..........................\ObjectAL.pdf
..........................\ObjectAL.xcworkspace
..........................\....................\contents.xcworkspacedata
..........................\ObjectAL
..........................\........\LICENSE.ObjectAL.txt
..........................\........\ObjectAL (OSX)
..........................\........\..............\ObjectAL (OSX)-Info.plist
..........................\........\..............\ObjectAL (OSX)-Prefix.pch
..........................\........\..............\en.lproj
..........................\........\..............\........\InfoPlist.strings
..........................\........\ObjectAL (iOS)
..........................\........\..............\Actions
..........................\........\..............\.......\OALAction+Private.h
..........................\........\..............\.......\OALAction.h
..........................\........\..............\.......\OALAction.m
..........................\........\..............\.......\OALActionManager.h
..........................\........\..............\.......\OALActionManager.m
..........................\........\..............\.......\OALAudioActions.h
..........................\........\..............\.......\OALAudioActions.m
..........................\........\..............\.......\OALUtilityActions.h
..........................\........\..............\.......\OALUtilityActions.m
..........................\........\..............\AudioTrack
..........................\........\..............\..........\OALAudioTrack.h
..........................\........\..............\..........\OALAudioTrack.m
..........................\........\..............\..........\OALAudioTrackNotifications.h
..........................\........\..............\..........\OALAudioTrackNotifications.m
..........................\........\..............\..........\OALAudioTracks.h
..........................\........\..............\..........\OALAudioTracks.m
..........................\........\..............\OALSimpleAudio.h
..........................\........\..............\OALSimpleAudio.m
..........................\........\..............\ObjectAL (iOS)-Prefix.pch
..........................\........\..............\ObjectAL.h
..........................\........\..............\ObjectALConfig.h
..........................\........\..............\OpenAL
..........................\........\..............\......\ALBuffer.h
..........................\........\..............\......\ALBuffer.m
..........................\........\..............\......\ALCaptureDevice.h
..........................\........\..............\......\ALCaptureDevice.m
..........................\........\..............\......\ALChannelSource.h
..........................\........\..............\......\ALChannelSource.m
..........................\........\..............\......\ALContext.h
..........................\........\..............\......\ALContext.m
..........................\........\..............\......\ALDevice.h
..........................\........\..............\......\ALDevice.m
..........................\........\..............\......\ALListener.h
..........................\........\..............\......\ALListener.m
..........................\........\..............\......\ALSoundSource.h
..........................\........\..............\......\ALSoundSourcePool.h
..........................\........\..............\......\ALSoundSourcePool.m
..........................\........\..............\......\ALSource.h
..........................\........\..............\......\ALSource.m
..........................\........\..............\......\ALTypes.h
..........................\........\..............\......\ALWrapper.h
..........................\........\..............\......\ALWrapper.m
..........................\........\..............\......\OpenALManager.h
..........................\........\..............\......\OpenALManager.m
..........................\....

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