Estoy intentando crear una pequeña aplicación de iPhone con algunos botones para reproducir sonidos WAV. Mis botones funcionan, pero tengo una pequeña latencia (~ 0,5 segundos).

Este es mi archivo .m:

#import "buttonSoundViewController.h"

@implementation buttonSoundViewController
//@synthesize player;

-(IBAction) playSoundA:(id)sender{
    NSString *path = [[NSBundle mainBundle] pathForResource:@"a" ofType:@"wav"];
    AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
    theAudio.delegate = self;
    [theAudio play];
}

-(IBAction) playSoundB:(id)sender{
    NSString *path = [[NSBundle mainBundle] pathForResource:@"b" ofType:@"wav"];
    AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
    theAudio.delegate = self;
    [theAudio play];
}

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
    [player release];
}

-(void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error {
}

-(void)audioPlayerBeginInterruption:(AVAudioPlayer *)player {
}

-(void)audioPlayerEndInterruption:(AVAudioPlayer *)player {
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
}

- (void)dealloc {
    [audioPlayer release];
    [super dealloc];
}   

@end

¿Cómo puedo evitar esta latencia entre reproducir diferentes sonidos?