iphone piano app doesnt play notes as expected - iphone

Question

Im making a piano test app, all the keyboard is sounding now playing notes that I've recorded using garage band, but I have some problems:
-the notes are 5 seconds long (minimum time of garage band), so a note cannot be repeated, I have to wait until the actual note about 1 sec sound and then silence for about 4 sec,
also sometimes notes cannot be played as expected,
Im using AVFoundation.framework,,
tried with AudioToolbox.framework, but it gives problems with my 4.1 ipod touch (doesnt work!!) but in the simulator looks fine
I also checked OpenAL, and ObjectAL, but seem a bit to much for just playing notes??
here the code
#import "pianoViewController.h"
#implementation pianoViewController
#synthesize myMusic;
#synthesize myMusic2;
#synthesize myMusic3;
#synthesize myMusic4;
#synthesize myMusic5;
#synthesize myMusic6;
#synthesize myMusic7;
#synthesize myMusic8;
#synthesize myMusic9;
#synthesize myMusic10;
#synthesize myMusic11;
#synthesize myMusic12;
-(IBAction)Play{
[myMusic play];
}
-(IBAction)Play2{
[myMusic2 play];
}
.
.
.
- (void)viewDidLoad {
NSString *pathToMusicFile = [[NSBundle mainBundle] pathForResource:#"c3" ofType:#"aif"];
myMusic = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile] error:NULL];
myMusic.delegate = self;
myMusic.numberOfLoops = 0;
myMusic.volume = 1.0;
NSString *pathToMusicFile2 = [[NSBundle mainBundle] pathForResource:#"c#" ofType:#"aif"];
myMusic2 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile2] error:NULL];
myMusic2.delegate = self;
myMusic2.numberOfLoops = 0;
myMusic2.volume = 1.0;
NSString *pathToMusicFile3 = [[NSBundle mainBundle] pathForResource:#"d" ofType:#"aif"];
myMusic3 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile3] error:NULL];
myMusic3.delegate = self;
myMusic3.numberOfLoops = 0;
myMusic3.volume = 1.0;
//[super viewDidLoad];
NSString *pathToMusicFile4 = [[NSBundle mainBundle] pathForResource:#"d#" ofType:#"aif"];
myMusic4 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile4] error:NULL];
myMusic4.delegate = self;
myMusic4.numberOfLoops = 0;
myMusic4.volume = 1.0;
//[super viewDidLoad];
NSString *pathToMusicFile5 = [[NSBundle mainBundle] pathForResource:#"e" ofType:#"aif"];
myMusic5 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile5] error:NULL];
myMusic5.delegate = self;
myMusic5.numberOfLoops = 0;
myMusic5.volume = 1.0;
NSString *pathToMusicFile6 = [[NSBundle mainBundle] pathForResource:#"f" ofType:#"aif"];
myMusic6 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile6] error:NULL];
myMusic6.delegate = self;
myMusic6.numberOfLoops = 0;
myMusic6.volume = 1.0;
NSString *pathToMusicFile7 = [[NSBundle mainBundle] pathForResource:#"f#" ofType:#"aif"];
myMusic7 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile7] error:NULL];
myMusic7.delegate = self;
myMusic7.numberOfLoops = 0;
myMusic7.volume = 1.0;
NSString *pathToMusicFile8 = [[NSBundle mainBundle] pathForResource:#"g" ofType:#"aif"];
myMusic8 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile8] error:NULL];
myMusic8.delegate = self;
myMusic8.numberOfLoops = 0;
myMusic8.volume = 1.0;
NSString *pathToMusicFile9 = [[NSBundle mainBundle] pathForResource:#"g#" ofType:#"aif"];
myMusic9 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile9] error:NULL];
myMusic9.delegate = self;
myMusic9.numberOfLoops = 0;
myMusic9.volume = 1.0;
NSString *pathToMusicFile10 = [[NSBundle mainBundle] pathForResource:#"a" ofType:#"aif"];
myMusic10 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile10] error:NULL];
myMusic10.delegate = self;
myMusic10.numberOfLoops = 0;
myMusic10.volume = 1.0;
NSString *pathToMusicFile11 = [[NSBundle mainBundle] pathForResource:#"a#" ofType:#"aif"];
myMusic11 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile11] error:NULL];
myMusic11.delegate = self;
myMusic11.numberOfLoops = 0;
myMusic11.volume = 1.0;
NSString *pathToMusicFile12 = [[NSBundle mainBundle] pathForResource:#"b" ofType:#"aif"];
myMusic12 = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile12] error:NULL];
myMusic12.delegate = self;
myMusic12.numberOfLoops = 0;
myMusic12.volume = 1.0;
[super viewDidLoad];
}
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
#end
So is there a way so that i can use AVFoundation to play multiple notes quickly? (almost overlapping like with AudioToolbox)
or what do you suggest?
thank you!

Answer 1

Instead of shoe-horning in a fix for something that shouldn't be a problem, I suggest instead that you use some audio editing software that does not have a minimum track length restriction.
One such example, which is Mac compatible and free, is Audacity: http://audacity.sourceforge.net/
Also, OpenAL is perfect for playing lots of short sounds, potentially overlapping. I think you can have 32 playing at once if you like.