Speeding up Soundboard for ruing on iphone (Objective C)

Hi guys I've just submitted an assignment for uni work, it was only required for app to work in iOS simulator but i liked the app and wanted it on my phone however its really slow! any suggestions much appreciated.

Heres my app delegate.m ---------------

#import <PAEEngine/PAEEngine.h>
#import "AppDelegate.h"

@interface AppDelegate ()
@property PAEAudioHost* host;
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.host = [PAEAudioHost audioHostWithNumOutputs:2]; //creates a stereo output using audio engine

    self.filenames = @[@"Sounds/FX/R1blaster1.wav", //sound sample array
                       @"Sounds/FX/R1blaster2.wav",
                       @"Sounds/FX/R1blaster3.wav",
                       @"Sounds/FX/R1blaster4.wav",
                       @"Sounds/FX/R1blaster5.wav",
                       @"Sounds/FX/R1saber1.wav",
                       @"Sounds/FX/R1saber2.wav",
                       @"Sounds/FX/R1saber3.wav",
                       @"Sounds/FX/R1saber4.wav", 
                       @"Sounds/FX/R1saber5.wav",
                       @"Sounds/FX/R1saber6.wav",
                       @"Sounds/FX/bombrx.wav",
                       @"Sounds/FX/Alarmrx.wav",
                       @"Sounds/FX/wilhelmrx.wav",
                       @"Sounds/FX/tie2rx.wav",
                       @"Sounds/FX/tie3rx.wav",
                       @"Sounds/FX/ship1rx.wav",
                       @"Sounds/FX/ship2rx.wav",
                       @"Sounds/FX/ship3rx.wav",
                       @"Sounds/FX/mayhemrx.wav",
                       @"Sounds/Themer1.wav",
                       @"Sounds/Imperialsongr1.wav",
                       @"Sounds/Characters/Ewokr3.wav",
                       @"Sounds/Characters/Ewokscreamr3.wav",
                       @"Sounds/Characters/Chewyr1.wav",
                       @"Sounds/Characters/jabbar1.wav",
                       @"Sounds/Characters/R2ar1.wav",
                       @"Sounds/Characters/c3porx.wav",
                       @"Sounds/Characters/R2screamr1.wav",
                       @"Sounds/Characters/trooperrx.wav",
                       @"Sounds/Characters/vaderbreathr1.wav",
                       @"Sounds/Characters/vaderdarkside.wav",
                       @"Sounds/Characters/vaderr1.wav",
                       @"Sounds/Characters/yodar1.wav",
                       @"Sounds/Characters/leiarx.wav",
                       @"Sounds/Characters/lukerx.wav",
                       @"Sounds/Characters/hanrx.wav"];

    self.chaelStrips = [[NSMutableArray alloc] initWithCapacity:self.filenames.count]; //sets number of chael strips
                                                                                         //to amount of samples
    for (int i = 0; i < self.filenames.count; ++i)
    {
        PAEChaelStrip* chaelStrip = [PAEChaelStrip chaelStripWithNumChaels:2]; //sets PAE engine parameters to
        PAEAmplitude* amp = [PAEAmplitude amplitudeWithNumInputs:2];                     //variables
        PAEControl* levelControl = [PAEControl controlWithValue:0.35]; //tus down amplitude to prevent clipping

        amp.level.input = levelControl;
        chaelStrip.inserts = @[amp];

        [self.chaelStrips addObject:chaelStrip];

    }

    self.host.mainMix = [PAEMixer mixerWithSources:self.chaelStrips];  //creates master mix of all parameters
    [self.host start];

    retu YES;                      //makes sure to retu the process to start
}

-(void)playSound:(NSInteger)index // sound trigger function
{
    if (index < 0 || index >= self.filenames.count) //if statement that retus signal value
        retu;

    PAEChaelStrip* strip = self.chaelStrips[index];
    PAEAudioFilePlayer* player = [PAEAudioFilePlayer audioFilePlayerNamed:self.filenames[index]]; //enables file player 
    player.loop = NO;                   //makes sure sound doesnt loop 
    strip.input = player;
}


@end