AVAudioPlayer not unloading cached memory after each new allocation

[ufbobbo]

I am seeing in Instruments that when I play a sound via the standard "AddMusic" example method that Apple provides, it allocates 32kb of memory via the prepareToPlay call (which references the AudioToolBox framework's Cache_DataSource::ReadBytes function) each time a new player is allocated (i.e. each time a different sound is played). However, that cached data never gets released.

This obviously poses a huge problem if it doesn't get released and you have a lot of sound files to play, since it tends to keep allocating memory and eventually crashes if you have enough unique sound files (which I unfortunately do).

Have any of you run across this or what am I doing wrong in my code? I've had this issue for a while now and it's really bugging me since my code is verbatim of what Apple's is (I think).

How I call the function:

    - (void)playOnce:(NSString *)aSound {
	
	// Gets the file system path to the sound to play.
	NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:aSound ofType:@"caf"];  
	
	// Converts the sound's file path to an NSURL object
	NSURL *soundURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];
	self.soundFileURL = soundURL;
	[soundURL release];
	
	AVAudioPlayer * newAudio=[[AVAudioPlayer alloc] initWithContentsOfURL: soundFileURL error:nil];  
	self.theAudio = newAudio; // automatically retain audio and dealloc old file if new m4a file is loaded
	
	[newAudio release]; // release the audio safely
	
	// this is where the prior cached data never gets released
	[theAudio prepareToPlay];

    // set it up and play
	[theAudio setNumberOfLoops:0];
	[theAudio setVolume: volumeLevel];
	[theAudio setDelegate: self];
	[theAudio play];

    }

and then theAudio gets released in the dealloc method of course.

[ufbobbo]

Please guys, if there's any advice you can lend to me it would be greatly appreciated.