Sparkfun Mp3 player Adding extra buttons arduino Uno?

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Hi guys I am trying to add 2x micro switch’s to my Sparkfun Mp3 player, and max out the sound.

I already have a 4x3 keypad working to select the tracks. I didn’t receive any error messages from the code, but the sound is still very low and when I press the micro switch, the track it players is stuck in a very fast loop.

I am a novice at this, so you may need to dumb it down for me.

#include <Keypad.h>
#include <SPI.h>
#include <SdFat.h>
#include <SdFatUtil.h> 
#include <SFEMP3Shield.h>

SdFat sd;
SFEMP3Shield MP3player;
const uint8_t volume = 0; // MP3 Player volume 0=max, 255=lowest (off)
const uint16_t monoMode = 1;  // Mono setting 0=off, 3=max

long randNumber;
int trackNumber = 2;

const byte ROWS = 4; 
const byte COLS = 3; 

char keys[ROWS][COLS] = {
  {'1','2','3'},
  {'4','5','6'},
  {'7','8','9'},
  {'*','0','#'}
  };
  
byte rowPins[ROWS] = {A0,A1,A2,A3}; 
byte colPins[COLS] = {A4,A5,3};
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS ); 
int footpin = 10; // change 10 to pin your microswitch uses.
int footstep = 0;

void setup()
{
  pinMode(footpin,INPUT_PULLUP);
  
 sd.begin(SD_SEL, SPI_HALF_SPEED);
 MP3player.begin();  
}

void loop() {
 
 char key = kpd.getKey();
  if(key != NO_KEY)
 {
   switch (key)
    {
                  
                  case '1':
                    if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track001.mp3");
                    break;
                  case '2': 
                    if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track002.mp3");
                    break;
                  case '3': 
                    if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track003.mp3");
                    break;
                  case '4': 
                    if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track004.mp3");
                    break;
                  case '5':
                     if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track005.mp3");
                    break;
                  case '6':
                    if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track001.mp3");
                    break;
                  case '7':
                     if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track006.mp3");
                    break;
                  case '8':
                     if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track007.mp3");
                    break;
                  case '9':
                     if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track008.mp3");
                    break; 
                  case '*':
                    if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track001.mp3");
                    break; 
                  case '0':
                    if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track001.mp3");
                    break;
                  case '#':
                    if(MP3player.isPlaying()) MP3player.stopTrack();
                     MP3player.playMP3("track001.mp3");
                    break;
   }
  }
footstep = digitalRead(footpin);
if(footstep = 1 ){
delay(100);
 
if(MP3player.isPlaying()) MP3player.stopTrack();
MP3player.playMP3("track001.mp3");
}
}
void initMP3Player()
{
  uint8_t result = MP3player.begin(); // init the mp3 player shield
  if(result != 0) // check result, see readme for error codes.
  {
    // Error checking can go here!
  }
  MP3player.setVolume(volume, volume);
  MP3player.setMonoMode(monoMode);
}