This space available to write a CoreAudio tutorial or add insights. Some areas in which the original poster was interested:

• Reading an audio file (actually using QTSoundFilePlayer)

• Directing this audio to other AudioUnit (QTSoundFilePlayer, but generating audio outputs, not directed to another kind of AudioUnit)

• Move the file reader to a particular time position in the file (QTSoundFilePlayer can do this, but what if I don’t use it)

• Drawing an image of the waveform (not really an audio project, but an NSView project)

Apple’s Mac OS X Audio Site

http://developer.apple.com/audio/index.html

Other pages at this site

AudioUnitEditorWindow (has sample code)

MTCoreAudio framework [http://aldebaran.armory.com/~zenomt/macosx/MTCoreAudio/]

MTCoreAudioHelp - example with some progress

XCodeSetupForCoreAudio

HowToRecordSound

CaptureToAudioCodec

ExtAudioFile - Workaround to a bug in the ExtAudioFile-Package

ArkSoundKit - Cocoa wrappers for AudioUnits

Apple source code samples:

http://developer.apple.com/samplecode/CASoundLab2/CASoundLab2.html

Other examples:

http://www.audiosynth.com/sinewavedemo.html (Very simple example for sound generation in CoreAudio; with source )

http://audacity.sourceforge.net is an open source audio editor that may show some useful techniques.

http://borkware.com/rants/sound/ - some more examples, including use of MTCoreAudio framework

http://www.macedition.com/bolts/bolts_20030509.php

http://www.snoize.com/ - Includes example to play a sound file through CoreAudio (using QuickTime); with source